Jim Hurrell, Senior Scientist

Climate Indices ->Data

Observational data is subject to corrections after it has been published and used in our indices. Once noted, these corrections are applied to our input data, and the corresponding climate indices may change. It is thus recommended that one downloads an entire climate index each time they wish to update their holdings.

Winter (Dec-Mar) Station Based NAO Index

The winter NAO index values are given in the table below. (Missing Value = -999.) Note: The station index value for year N refers to an average of December year N-1 and January, February, and March year N. (Example: The 1899 value contains the average of December 1898 and January, February, and March 1899.)

The winter values are also available as two columns (year and value) in the following formats: ascii | Microsoft Excel File (.xls)

          00      01      02      03      04      05      06      07      08      09     

1860  -999.  -999.  -999.  -999.  -1.02  -1.24   0.54  -1.38   2.81   1.70
1870  -3.01  -1.01  -0.76  -0.50   2.32  -1.35   0.21   0.05   1.46  -2.22
1880   0.89  -3.80   3.87  -0.23   1.44  -0.89  -1.12   0.45  -2.75  -0.01
1890   1.78  -0.82  -2.02  -1.07   2.68  -3.97   1.12   1.09   1.02   0.03
1900  -2.13  -0.33  -1.41   3.89   0.23   1.98   2.06   2.06   1.44   0.00
1910   2.10   0.29   0.24   2.69   1.48  -0.20  -0.69  -3.80  -0.80  -0.80
1920   3.18   1.63   1.85   1.73  -1.13   2.39   0.11   1.72   0.63  -1.03
1930   0.91  -0.16  -0.50   0.25   0.86   0.97  -3.89   0.72   1.79   0.37
1940  -2.86  -2.31  -0.55   1.48   0.61   1.64   0.27  -2.71   1.34   1.87
1950   1.40  -1.26   0.83   0.18   0.13  -2.52  -1.73   1.52  -1.02  -0.37
1960  -1.54   1.80  -2.38  -3.60  -2.86  -2.88  -1.69   1.28  -1.04  -4.89
1970  -1.89  -0.96   0.34   2.52   1.23   1.63   1.37  -2.14   0.17  -2.25
1980   0.56   2.05   0.80   3.42   1.60  -0.63   0.50  -0.75   0.72   5.08
1990   3.96   1.03   3.28   2.67   3.03   3.96  -3.78  -0.17   0.72   1.70
2000   2.80  -1.90   0.76   0.20  -0.07   0.13  -1.09   2.80   2.10  -0.40  

Note: The values in the above table differ slightly from those in Hurrell (1995) because of continual updates to the data and a change in the base period. The SLP anomalies at each station were normalized relative to the 120-year period 1864--1983. Hurrell (1995) normalized relative to 1864--1994.(Hurrell (1995): Science 269:676-679)

Note #2: The 1997 value was changed from -0.20 to -0.17 after it was discovered that the WMSSC December 1996 SLP value for Reykjavik had changed. It was initially reported to be 1014.0, and had since been corrected to 1013.3hPa.

Return to Climate Indices Table

Monthly Station Based NAO Index

Monthly index of the NAO based on the difference of normalized sea level pressures (SLP) between Ponta Delgada, Azores and Stykkisholmur/Reykjavik, Iceland since 1865. (Missing Value = -99.)

As of April 2003, the Ponta Delgada station that was used in the construction of this timeseries stopped reporting. To allow this timeseries to be updated, we have started to use the nearest NCEP/NCAR Reanalysis grid point as a substitute. The following timeseries uses Ponta Delgada observational data from Jan. 1865 - Mar. 2003, and NCEP/NCAR Reanalysis data from Apr 2003 to present. The correlation between a monthly timeseries constructed with the Ponta Delgada observational data and one constructed with NCEP/NCAR Reanalysis data is .99 (1948-2003).

        J     F     M     A     M     J     J     A     S     O     N     D

1865  -0.6  -1.2   0.2  -0.2  -0.4   0.0   0.5   1.5   1.8  -2.0  -0.9   0.8 
1866   0.5   0.8  -0.6  -2.3  -2.0   0.9  -0.5  -0.2   2.4  -0.3  -0.5   0.2 
1867  -3.5   1.1  -4.3   1.8  -4.2   0.1  -2.0   1.9   1.4   2.2  -3.5  -0.1 
1868   0.7   3.0   3.6   1.7   2.3   3.1   0.4   1.5  -2.8   3.5  -1.8  -0.1 
1869   1.0   2.5   0.2  -0.2  -2.7  -1.9  -0.3  -1.0  -0.4  -1.4   1.4   0.0 
1870   0.4  -2.8  -2.0   1.1   1.5   0.3   0.5  -3.6   0.2   0.9  -2.1  -3.0 
1871   2.0  -0.3   0.9  -2.6  -1.5  -0.9   0.8   0.0  -2.2   0.2  -3.1   1.1 
1872   1.0  -0.7  -1.1  -0.5   1.0   0.2  -2.3  -2.4  -1.8   1.6   0.4  -0.5 
1873   1.3  -0.6   1.2  -3.3  -0.9   1.9  -0.1   3.1  -2.2   1.7  -1.9   0.6 
1874   1.5   0.9   0.9   2.0  -1.3   0.1   0.6   0.9   1.4   1.8  -0.2   0.1 
1875  -0.7  -1.0  -0.8  -1.8   2.4   3.2  -1.1  -1.6  -1.5   0.1  -3.1  -0.6 
1876   0.8  -0.7   0.5  -0.6   0.8   3.3   1.7   0.3  -3.7  -1.9  -4.4  -2.1 
1877   0.9   1.1   0.1  -3.1  -2.8  -0.1   1.3  -5.5  -3.2   0.0   2.2   2.5 
1878   0.5  -0.2   0.2  -2.7  -0.8  -1.2   0.4  -3.5   1.0  -1.4  -3.1  -5.5 
1879  -0.9   0.9   1.2  -0.2   1.6  -1.4  -0.4  -0.7   2.9  -0.3  -3.9  -1.2 
1880  -0.8   1.0   0.5   1.3  -0.6  -0.2  -3.6  -0.4  -1.1  -4.7   1.0  -2.2 
1881  -5.9  -0.9  -2.3  -1.9   0.9   1.2   1.7  -0.9  -2.2  -0.9   1.4   2.7 
1882   1.0   0.6   3.6  -1.3  -1.3   0.1   1.8   0.7   1.6   0.3   1.6  -1.4 
1883   0.7   2.4  -2.4   1.3   1.3  -2.3  -2.5   1.3  -0.7   2.5   1.9   0.7 
1884   0.7   0.8   1.3  -2.0   0.3   0.9  -3.0   0.9   1.4   1.4  -1.1   2.1 
1885  -0.4  -1.8   0.9   1.2  -1.6   1.7   0.3  -4.9   1.9  -0.3  -1.2  -1.3 
1886   0.3  -0.1  -0.9  -1.2  -1.2   0.8   0.7   3.0  -1.2   0.7   1.6  -0.2 
1887   1.7   1.1  -1.9  -3.2   0.5  -2.0  -0.3  -2.3  -0.7  -3.3  -1.1  -2.7 
1888  -1.5  -1.6  -1.5  -0.8  -1.5  -1.7  -1.7  -0.4  -3.0  -3.1   2.2   1.4 
1889   1.2   0.2  -0.2   1.7   0.5   1.7  -3.0   1.5  -1.2   1.0   1.7   3.1 
1890   2.3  -0.7   2.0   1.8  -0.6   1.7   1.4   1.1   1.3   0.0   2.7  -0.8 
1891   0.2   0.9  -1.2  -1.6  -0.8  -4.0  -2.8   0.2   1.6   1.1   0.0   1.7 
1892   0.5  -1.8  -1.4  -0.6  -2.2  -1.6   0.0  -0.2   2.2  -3.2   0.7  -1.3 
1893  -2.1   0.8  -0.4  -0.2  -1.2  -2.6   0.2  -2.8   1.7   0.4  -2.3   2.3 
1894   0.5   3.1   1.7   1.8  -0.8   2.7   1.2   0.3  -4.0  -3.1   2.2   0.6 
1895  -1.7  -4.9   1.0  -0.7   0.6  -0.4   0.1  -0.5   0.1  -2.8  -0.6  -0.5 
1896  -0.9   0.9   2.6   2.5   1.2  -0.6   2.3   0.0  -0.1  -2.5  -0.9   1.8 
1897  -1.5   1.1   1.0   3.6   0.1  -2.6  -1.0   1.4   1.0  -2.1  -0.5   0.6 
1898   1.2   1.2  -0.5   2.2  -1.1  -1.5  -1.5   1.1  -0.8  -0.9   0.9   0.6 
1899  -1.3  -1.6  -2.1  -0.3  -1.4   1.4   2.0  -2.6   1.4  -2.0   0.6  -0.9 
1900   1.8  -3.1  -2.1   0.8   0.7  -0.7  -1.0   0.5   2.3  -0.3   2.2   1.2 
1901   0.0  -2.9  -0.6   1.3  -1.7   1.6   1.2   1.0   1.2   2.0  -2.4   0.1 
1902  -0.3  -2.8   0.7  -1.9   0.9  -4.0  -2.4  -1.6  -2.2   0.5   0.0   0.6 
1903   0.1   1.8   3.6  -0.1   1.2  -3.6  -0.3   0.8  -0.6  -0.9   0.8   0.5 
1904   1.8   0.9   0.6   4.1   0.8  -0.7  -1.6  -1.9   1.1   0.2  -0.5  -1.3 
1905   0.4   1.4   1.7  -1.7   1.4  -0.7   0.5   0.5   1.3  -1.9   0.9  -0.3 
1906   1.8   1.8  -0.4   2.5  -2.9  -1.6   2.9  -1.8   1.2   1.5   0.1   1.5 
1907   0.8   1.6   3.2   1.6  -2.8   0.7  -2.4  -0.5  -0.1   0.1   1.8   0.6 
1908   0.9   2.0   2.3  -1.2   1.1   1.1  -0.4  -0.4   0.3  -1.0   0.2   1.8 
1909   1.4  -0.1  -1.9   0.4  -2.1  -0.9   3.3   2.5  -1.6   2.1  -1.9  -2.5 
1910   2.0   3.4   1.7  -1.0   2.6   0.4  -0.6  -1.3  -1.3  -0.8  -1.9  -0.4 
1911   0.8   0.8   0.2  -0.7   3.2   0.0  -1.8  -1.0  -0.1  -0.7   0.5   0.9 
1912  -1.1  -2.4   1.9   1.1   0.6   0.0  -0.7  -1.4  -2.3   1.5   0.9   1.9 
1913   0.5   0.3   3.1   2.7   1.3   1.7  -1.0   1.0  -1.6  -1.9   3.6   0.3 
1914  -0.5   1.4   1.3   1.4   2.8   2.4  -0.5   0.7  -0.2  -0.4   0.1   1.4 
1915   0.8   0.9  -3.2   3.1  -2.7  -2.6   0.3  -2.6  -2.0   1.4  -2.8  -2.7 
1916   2.0   1.9  -3.0   1.0  -0.3  -1.9   0.4  -1.6  -1.1   2.4  -0.3  -3.7 
1917  -2.3  -1.2  -0.4  -2.6  -2.8   0.5  -1.7  -0.4   1.8   1.8   1.7  -1.8 
1918  -4.5   2.5   0.8  -0.4   0.4   1.5  -3.0   1.2   0.8   2.0   0.3   0.7 
1919   0.0  -2.7  -0.4   1.0  -0.7   3.3  -1.2   1.0   0.8  -1.2  -1.6   2.3 
1920   2.3   1.0   3.6  -1.8   2.3  -0.3   3.1  -1.0   1.3  -0.2   2.1  -1.8 
1921   1.6   0.3   3.1  -0.5   2.8  -1.0  -1.2   0.8  -0.2  -1.2  -0.6   2.7 
1922   0.6   2.6   0.5  -0.1   1.4   2.9   2.0   1.6   1.7  -3.7  -0.3   0.8 
1923   1.5   0.8   0.0   0.5  -0.8   0.8   2.4   0.2   1.8   1.3   0.2   1.2 
1924   0.4  -0.8  -3.5  -2.2  -0.3  -0.1   1.5   1.8   1.2   0.7   0.6   2.8 
1925   1.0   2.0  -1.1   2.1   1.8   1.1   2.7   1.1  -0.1  -1.6  -1.6  -4.3 
1926   0.3   0.4   0.2   0.9  -1.4  -1.8   0.7   0.8  -1.1  -2.8   2.1  -0.9 
1927   1.9   0.3   1.9   0.9  -2.3  -0.2  -0.3   0.2   0.0  -3.2   0.5  -3.5 
1928   3.0   1.7  -1.0   0.8  -3.1  -2.9   0.8  -1.5  -1.0   2.0   1.7   0.6 
1929  -4.1  -0.3  -1.4  -3.0   2.3  -0.7  -0.1   0.3   1.3   1.9   1.9   2.6 
1930   1.4  -0.2  -1.1  -0.3   2.5   2.8  -0.5   0.0  -2.8   0.6   1.0   2.1 
1931  -0.1   1.8  -3.4   1.1  -0.7  -1.9   2.1  -1.9  -1.4  -0.9   2.4   0.0 
1932   1.1  -3.5  -1.3   0.7  -1.5  -1.3   1.8   1.6   0.3   1.8   0.5   0.1 
1933   1.5  -2.1   0.7  -1.9   0.3   2.2   2.3   1.8  -0.4  -2.1   0.3  -0.6 
1934   1.7   0.6   2.2  -2.0   2.8  -2.0   0.4   2.4   2.1   0.9  -0.5  -1.1 
1935  -0.1   2.2   0.2  -2.0  -1.8   0.8   3.8   2.0   0.4   3.6   1.7  -1.7 
1936  -3.0  -2.6  -0.9  -0.9   0.9   0.5   1.1   2.1  -2.3   2.4   1.9   1.3 
1937   0.6   0.1  -2.0   1.0   1.7  -0.6  -0.1   1.3   1.4  -0.6  -3.1  -1.1 
1938   2.2  -0.8   2.4  -1.9   1.1   1.3   2.2   1.3   1.6   3.8   2.1   0.7 
1939  -2.1   2.2   0.7  -0.4   0.3  -0.4  -0.6   1.3  -4.0  -0.6   1.5  -1.7 
1940  -2.6  -2.1  -1.5  -0.5  -0.2   1.8   0.6   0.7   0.1  -0.2   1.5  -0.1 
1941  -2.9  -0.9  -0.9  -1.7   0.3   0.3   1.7   0.2  -1.2  -1.1  -0.2   0.8 
1942   1.6  -2.7  -2.0  -0.4  -0.1  -2.0   1.5   1.8   2.1   1.0  -1.5   0.3 
1943  -0.7   2.7   0.7   3.4   0.6   0.7   0.4  -1.6   2.6   0.8   1.6   1.1 
1944   1.0  -0.2  -1.8  -0.4   0.7  -0.4  -3.0   1.7   1.1   2.0   0.5   1.2 
1945  -2.2   2.5   0.8  -2.2  -0.3   0.5   0.2   1.4   0.5  -1.9  -2.9  -2.1 
1946   1.4  -0.2   0.2   3.0  -2.5   2.7   2.3   2.0   1.3  -2.7  -0.9   1.6 
1947  -0.2  -4.2  -2.8   3.3  -0.2  -0.1   0.5  -0.2   2.4  -0.2  -1.9  -2.1 
1948   0.6  -0.5   2.0   1.6  -0.4  -0.4  -0.6  -0.2   0.1   1.5  -1.6  -0.5 
1949   0.9   1.9  -0.2   2.5  -0.1  -1.7  -0.8  -1.1  -0.8   0.1   1.6   0.4 
1950   0.0   1.5   0.0   1.6  -2.2  -0.1  -0.1   1.4   3.0   1.2  -0.6  -1.0 
1951   1.0   1.4  -2.1  -1.6  -1.8  -2.8  -0.3   2.2   0.2   1.5  -0.1   2.4 
1952   2.0  -1.2  -2.1   2.2  -2.0  -0.2   0.9  -0.5  -1.8  -0.2  -1.8  -0.8 
1953  -1.2   0.6   0.5  -2.7  -1.2   1.5   2.2   2.1   1.4   1.6   2.1   0.9 
1954   0.3   1.6   0.7   0.9  -1.6   1.1   3.3   0.0   2.4   1.0   2.1   1.6 
1955  -2.0  -2.2  -2.6   0.8   0.0  -0.2   1.4   1.3   3.7  -1.3  -3.1  -0.8 
1956  -0.8  -2.2   0.6  -1.6   4.9   1.0  -0.8  -1.2  -0.7   0.9   1.7   1.7 
1957   1.8  -1.0  -1.7   1.0   0.3  -3.1  -1.6   0.8  -1.9   2.5  -1.9   1.3 
1958  -0.6  -2.4  -2.5   1.5  -0.6  -2.0  -2.1  -0.5  -1.3   1.6   1.7  -1.0 
1959  -3.0   1.6   1.7   0.8  -0.4   1.4   1.9  -0.2  -0.2   1.5   1.2   2.0 
1960  -2.0  -3.3  -0.8   1.5   0.0   0.6   2.0  -3.5   1.4  -2.9   0.5   2.1 
1961   0.9   1.0   0.3  -1.3  -1.2   3.5   0.3   1.3   2.1   1.8  -0.2  -4.5 
1962   2.1   0.9  -4.2   0.4  -0.3  -0.4  -2.4   0.9  -0.6   0.0  -0.4  -1.2 
1963  -5.1  -1.2   0.9  -0.9   5.2  -1.8  -2.3   0.3   2.0   2.1  -1.2  -2.5 
1964  -1.5  -1.5  -1.3   1.2   1.6  -0.3   1.6  -3.0  -0.9   1.2   0.5   0.0 
1965  -0.2  -3.7  -1.2   3.0  -0.7   1.1  -0.9   0.6  -0.2  -0.6  -1.9   0.7 
1966  -3.5  -2.5   0.4  -1.1   2.3   0.9   0.8  -2.9  -1.2  -3.4   0.7   1.8 
1967  -1.6   1.4   2.4   0.7  -0.4   2.1  -0.5   0.2   0.1   2.0   1.0  -0.9 
1968   0.5  -1.7   1.7  -1.9  -0.8   0.3  -3.6  -1.1  -1.0  -3.1  -1.7  -1.4 
1969  -3.3  -3.2  -2.6   1.5  -1.3   0.0   1.2  -0.6   1.8   0.5  -0.6   1.3 
1970  -2.9   1.1  -1.3   0.9   2.0   0.6  -0.5  -0.6   0.3  -0.6   0.0  -1.5 
1971  -1.2   1.0   0.2  -1.8   2.4  -1.9  -1.9   2.2  -1.8  -0.4   1.1   0.8 
1972   0.4   0.6   1.1   1.2   2.7   3.1  -0.8   0.1  -3.1  -1.4   1.3   1.7 
1973   0.5   2.3   0.9  -3.3  -0.8   1.9   0.5   0.8  -0.3  -1.1  -1.2   0.0 
1974   2.2   1.1   0.3  -0.4  -0.3  -1.0   1.1   0.0   1.0  -0.1   0.8   1.8 
1975   1.3  -0.6  -0.3   0.1  -1.0  -0.9  -0.7  -0.4   2.0  -1.0   1.2  -0.6 
1976   0.7   1.2   2.3   0.4   2.6   0.7  -3.0  -2.6  -4.6   1.6   1.2  -2.6 
1977  -1.7  -1.0  -0.5   0.6  -0.4  -1.5   0.5  -0.5  -0.9   0.7  -0.7  -1.6 
1978   1.6  -3.1   2.9  -1.9   1.5   1.2  -2.3  -2.1   0.2  -0.2   2.7  -3.1 
1979  -2.6  -1.0   1.2  -1.5  -0.1   0.6   0.5   0.0   0.4   0.2   1.3   1.3 
1980  -1.7   0.5   0.0  -0.2  -2.1   1.3  -1.6  -2.1   1.6  -1.3  -2.7   1.5 
1981   1.0   1.2  -1.1  -1.2   0.1  -1.8   1.6   0.4  -0.3   0.3  -0.8  -1.6 
1982  -1.3   1.7   2.5  -0.6   1.0  -3.0  -0.8   2.5   0.5   1.1   2.2   2.6 
1983   2.6  -1.1   2.0  -1.2  -0.4   0.6  -0.5   1.4  -1.9   2.0  -3.6   0.3 
1984   3.4   1.6  -1.9  -1.0   1.6   0.3  -1.7   0.5   0.4   1.3   0.3   1.5 
1985  -2.7  -1.5   0.6   0.2  -0.9  -1.9   0.3   1.2  -1.7  -0.4  -2.4  -1.2 
1986   2.4  -2.7   3.9   0.0   2.4   0.6   0.6  -3.7  -3.3   3.6   3.3   1.9 
1987  -3.5  -0.7  -0.1   0.6  -1.8  -1.1   0.0  -3.3  -0.4   0.8   0.1  -2.3 
1988   1.1   0.3   0.9  -2.4  -0.4   0.2   0.8   1.5   0.6  -1.6  -2.2   0.5 
1989   2.4   3.2   3.2   0.8   0.3  -1.2  -0.6   2.4  -0.4   0.9  -1.4  -3.4 
1990   3.0   3.2   2.3   3.1  -2.0   1.0  -0.1   0.9  -0.7   0.5  -1.1   1.1 
1991   0.7   0.5  -0.1   1.1   1.0  -0.9  -1.4   1.6  -0.5  -0.3   1.6   0.2 
1992  -1.0   2.0   2.0   1.8   0.3  -0.2  -0.2   2.3  -0.5  -1.2   2.2   1.2 
1993   2.1   0.3   1.2   1.5  -3.6  -0.3  -0.2  -0.2  -2.6  -0.7   2.5   2.6 
1994   2.0  -0.4   4.4   1.1  -0.5   2.1   0.7  -1.0  -0.1  -1.2   0.2   1.6 
1995   1.4   2.3   1.8  -1.9  -0.8  -2.1  -1.4  -0.8   0.6  -0.3  -3.0  -3.8 
1996  -1.8   0.9  -2.6  -1.0  -1.8   0.7   1.2   0.6  -0.6   1.6   1.0  -3.7 
1997  -2.4   3.7   1.2  -1.8  -1.9  -3.1   1.1   0.7  -0.8  -2.6   0.1  -0.5 
1998  -0.7   0.7   0.5   0.7  -0.2  -1.0   0.3   1.5  -2.0   1.0   0.9   1.6 
1999   1.3   2.2   0.2   0.0   0.4   1.2  -1.8  -2.6   0.9   0.4   0.8   1.7 
2000   0.1   3.1   0.4  -2.5   1.4  -0.5  -2.9   0.4   0.2   4.5   0.0  -2.2 
2001  -0.1  -0.5  -1.5   1.4  -1.0  -1.9   0.3   0.6  -2.8   0.9   1.4  -4.1 
2002   0.5   1.7   0.9   2.2   1.9   1.9   1.6   0.6  -4.4  -2.0   1.3  -2.4 
2003   0.4   1.2   0.5  -2.0   1.9  -0.5   0.4  -2.0  -0.6  -1.0   1.4  -1.1
2004   0.2  -1.4   1.5   1.7   0.9  -1.5  -0.7  -1.5   2.0  -2.0  -0.2   2.6
2005   1.0  -0.6  -3.0   0.3  -1.5  -1.4  -99.  -99.  -99.  -99.  -99.  -0.7
2006   1.0  -0.7  -1.8   1.0  -0.6   0.0  -0.3  -0.9  -0.4  -2.4   1.2   2.1
2007   1.1  -0.2   3.1  -0.1   2.9  -3.6  -1.0  -0.2  -0.1   0.9  -1.2   0.9
2008   1.4   0.4   1.6  -2.8  -2.1  -0.6  -0.6   1.4  -0.2   2.8   1.1   0.3
2009   1.5  -0.3   1.4   2.5   2.3  -4.3  -2.7   1.6  -99.  -99.  -99.  -99.
 

Return to Climate Indices Table

Seasonal Station Based NAO Index

Seasonal index of the NAO based on the difference of normalized sea level pressures (SLP) between Ponta Delgada, Azores and Stykkisholmur/Reykjavik, Iceland since 1865. (Missing Value = -99.)

As of April 2003, the Ponta Delgada station that was used in the construction of this timeseries stopped reporting. To allow this timeseries to be updated, we have started to use the nearest NCEP/NCAR Reanalysis grid point as a substitute. The following timeseries uses Ponta Delgada observational data from Jan. 1865 - Mar. 2003, and NCEP/NCAR Reanalysis data from Apr 2003 to present. The correlation between a monthly timeseries constructed with the Ponta Delgada observational data and one constructed with NCEP/NCAR Reanalysis data is .99 (1948-2003).

       DJF   JFM   FMA   MAM   AMJ   MJJ   JJA   JAS   ASO   SON   OND   NDJ   

1865  -1.5  -0.9  -0.8  -0.1  -0.4  -0.1   0.9   2.0   0.2  -1.0  -0.9   0.3
1866   1.1   0.5  -0.6  -2.4  -2.2  -1.0   0.2   1.1   0.9   0.5  -0.3  -2.3
1867  -1.2  -3.3  -1.0  -4.0  -1.0  -3.5   0.0   0.8   2.9  -0.6  -0.9  -1.2
1868   2.1   3.7   4.7   4.5   3.9   3.4   2.8  -0.7   1.5  -0.4   0.5  -0.3
1869   2.0   2.1   1.7  -1.0  -2.6  -2.8  -1.7  -0.8  -1.5   0.0   0.0   0.9
1870  -1.4  -2.2  -2.6  -0.3   1.6   1.4  -1.3  -1.3  -0.7  -0.8  -2.4  -1.2
1871  -0.4   1.3  -0.7  -1.3  -3.0  -1.0  -0.1  -0.9  -0.9  -2.9  -0.9  -0.2
1872   0.6  -0.3  -1.3  -0.7   0.3  -0.3  -2.1  -3.3  -0.8   0.5   0.6   0.8
1873   0.2   1.0  -1.0  -1.2  -1.9   0.4   2.6   0.1   1.3  -1.2   0.2   0.4
1874   1.6   1.7   1.8   1.1   0.6  -0.4   0.9   1.7   2.3   1.5   0.7  -0.5
1875  -1.0  -1.3  -1.8  -0.5   1.6   2.7   0.5  -2.2  -1.2  -2.7  -1.9  -1.2
1876  -0.2   0.3  -0.3   0.4   1.7   3.2   3.0  -1.2  -3.0  -5.9  -4.3  -2.6
1877   0.2   1.1  -0.4  -2.7  -3.8  -1.2  -2.2  -4.0  -3.7   0.1   2.6   2.6
1878   1.2   0.2  -1.1  -1.5  -3.0  -1.0  -2.2  -0.9  -1.8  -2.5  -5.4  -4.7
1879  -2.4   0.6   1.2   1.5   0.1   0.1  -1.3   1.3   1.0  -1.6  -2.9  -2.9
1880  -0.4   0.4   1.4   0.8   0.5  -2.0  -1.9  -2.4  -3.9  -2.6  -2.9  -4.4
1881  -4.7  -4.7  -2.7  -2.4  -0.3   2.0   1.0  -0.9  -2.0  -0.6   1.9   2.7
1882   2.1   2.5   2.0   1.5  -1.5   0.0   1.2   2.1   1.2   2.0   0.2   0.5
1883   1.2   0.7   0.8  -0.6   0.5  -1.5  -1.8  -0.9   1.8   2.5   2.5   1.6
1884   1.1   1.4   0.4   0.0  -0.8  -0.6  -0.3   0.0   2.0   0.7   1.2   0.3
1885  -0.4  -0.7  -0.2   0.7   0.8   0.1  -1.3  -1.0  -1.2  -0.2  -1.5  -1.0
1886  -0.5  -0.4  -1.1  -1.8  -1.2   0.0   2.3   1.1   1.1   1.0   1.0   1.6
1887   1.4   0.6  -1.7  -2.9  -2.9  -0.9  -2.4  -1.7  -3.5  -3.1  -3.6  -2.8
1888  -3.0  -2.4  -2.2  -2.1  -2.1  -2.6  -2.0  -2.7  -3.6  -1.6   0.6   2.5
1889   1.5   0.6   0.8   1.1   2.4  -0.1   0.3  -1.5   0.6   1.2   3.1   3.8
1890   2.3   1.8   1.4   2.2   1.7   1.1   2.0   1.9   1.1   2.5   0.9   1.0
1891   0.2   0.0  -0.7  -2.0  -3.5  -3.8  -3.3   0.0   1.7   1.4   1.5   1.2
1892   0.0  -1.4  -2.2  -2.3  -2.4  -2.3  -1.1   1.2  -1.1  -0.4  -1.8  -1.7
1893  -1.3  -0.9   0.2  -0.9  -2.1  -2.1  -2.8  -0.4  -0.1  -0.6   0.3   0.5
1894   3.1   2.8   3.7   1.8   2.1   1.5   2.2  -1.8  -3.9  -2.1   0.1   0.2
1895  -3.5  -3.2  -3.0   0.6  -0.4   0.2  -0.4   0.0  -2.0  -2.1  -1.8  -1.1
1896  -0.2   1.2   3.0   3.7   2.1   1.4   0.7   1.0  -1.7  -2.1  -0.5  -0.4
1897   0.6   0.3   2.7   2.6   1.2  -1.7  -1.2   0.8  -0.5  -1.2  -0.9   0.8
1898   1.6   1.1   1.3   0.3   0.2  -2.1  -0.9  -0.5  -0.5  -0.3   0.4  -0.2
1899  -1.5  -2.5  -2.4  -2.3  -0.2   0.8   0.5   0.5  -1.7  -0.3  -1.1   1.0
1900  -1.2  -1.7  -2.9  -0.8   0.6  -0.4  -0.6   1.2   1.1   2.4   1.7   1.6
1901  -1.1  -1.9  -1.8  -0.5   0.7   0.4   2.0   1.8   2.4   0.1  -0.3  -1.2
1902  -1.8  -1.4  -2.2  -0.1  -2.8  -2.8  -4.2  -3.2  -1.4  -0.7   0.5   0.3
1903   1.3   2.8   3.1   3.1  -1.2  -1.4  -1.9  -0.2  -0.6  -0.2   0.3   1.8
1904   1.7   1.7   2.5   2.9   2.9  -0.5  -2.0  -0.9  -0.1   0.2  -0.9  -0.6
1905   0.5   1.7   1.2   0.9  -0.7   0.8   0.2   1.3  -0.5   0.1  -0.6   1.4
1906   2.0   1.8   2.0  -0.2  -0.6  -1.4  -0.5   1.1   0.8   1.4   1.5   1.3
1907   2.0   2.8   3.5   2.1  -0.1  -2.5  -1.0  -1.4  -0.1   1.4   1.4   1.8
1908   2.0   2.7   2.3   1.7   0.4   1.1   0.2  -0.2  -0.6  -0.3   0.7   1.9
1909   1.5  -0.2  -0.9  -2.0  -1.3  -0.4   2.1   1.6   1.6  -0.7  -1.4  -0.8
1910   2.0   3.7   2.8   1.8   0.9   1.5  -0.8  -1.7  -1.7  -2.4  -1.7  -0.6
1911   0.7   0.9   0.4   1.1   1.3   1.2  -1.3  -1.3  -0.9  -0.1   0.4  -0.1
1912  -1.6  -1.0  -0.1   2.3   1.2   0.0  -1.1  -2.5  -0.7   0.6   2.3   1.7
1913   1.3   1.9   2.9   4.2   3.4   1.3   0.9  -1.0  -1.7   0.6   1.2   1.4
1914   0.6   1.2   2.2   2.8   3.6   2.7   1.4  -0.1  -0.1  -0.3   0.6   1.2
1915   1.6  -0.6   0.0  -1.9  -0.5  -3.0  -2.7  -2.5  -1.1  -2.0  -2.4  -1.4
1916   1.1   0.7   0.0  -1.9  -0.4  -1.1  -1.7  -1.3   0.4   0.8  -1.2  -3.4
1917  -3.5  -2.1  -2.0  -2.8  -3.1  -2.3  -0.8   0.0   1.9   3.1   0.7  -2.9
1918  -1.8  -0.6   1.9   0.5   0.7  -0.3   0.1  -0.3   2.2   1.8   1.4   0.5
1919  -1.3  -1.6  -1.6   0.0   1.9   0.7   1.6   0.3   0.0  -1.4   0.0   1.9
1920   2.9   3.4   2.0   2.6  -0.2   2.6   0.8   1.7   0.2   1.9   0.0   1.0
1921   0.2   2.4   1.7   3.2   0.7   0.7  -0.7  -0.2  -0.5  -1.2   0.7   1.5
1922   3.0   2.0   2.0   0.9   2.2   3.3   3.3   2.5  -1.1  -1.7  -1.3   1.3
1923   1.7   1.2   0.8   0.0   0.3   1.0   1.7   2.3   1.9   1.8   1.4   0.9
1924   0.3  -1.8  -3.4  -3.9  -1.7   0.5   1.6   2.4   1.8   1.4   2.3   2.3
1925   3.0   1.1   1.5   1.1   3.0   2.9   2.4   1.7  -0.7  -2.2  -4.0  -2.7
1926  -1.5   0.5   0.7   0.0  -1.0  -1.4  -0.2   0.2  -2.1  -0.6  -0.7   1.7
1927   0.8   2.0   1.6   1.0  -0.7  -1.6  -0.1  -0.1  -2.1  -1.6  -3.1   0.4
1928   1.1   2.0   0.8  -1.6  -2.6  -3.1  -1.9  -0.9   0.2   1.9   2.1  -1.5
1929  -2.2  -3.0  -2.1  -1.6  -1.1   0.9  -0.4   0.8   2.0   3.0   3.3   3.0
1930   1.8   0.1  -0.8   0.1   2.5   2.9   1.4  -1.9  -1.0  -0.2   2.0   1.5
1931   2.0  -0.7  -0.3  -2.3  -0.5  -0.6  -1.1  -0.9  -2.1   0.4   0.9   1.8
1932  -1.4  -2.0  -2.7  -1.2  -0.9  -0.9   0.8   1.7   1.9   1.6   1.1   1.2
1933  -0.3   0.0  -1.7  -0.3  -0.1   2.3   3.1   1.6  -0.9  -1.2  -1.1   0.9
1934   1.0   2.2   0.9   1.7  -0.9   0.8   0.2   2.7   2.6   1.2  -0.5  -0.8
1935   0.7   1.2   0.8  -1.6  -1.9   1.0   3.2   2.9   3.3   3.5   1.5  -2.0
1936  -3.9  -3.5  -2.6  -0.9   0.1   1.2   1.8   0.1   1.3   1.8   2.8   1.9
1937   0.9  -0.5  -0.7  -0.3   1.3   0.8   0.4   1.6   0.8  -1.9  -2.5  -0.6
1938   0.2   1.8   0.0   1.2  -0.2   2.3   2.3   2.5   3.8   4.4   3.2   0.0
1939   0.5   0.4   1.7   0.4  -0.3  -0.3   0.1  -2.1  -1.9  -1.0  -0.5  -1.8
1940  -3.4  -3.2  -2.5  -1.4   0.4   0.9   1.5   0.5   0.2   1.0   0.6  -1.2
1941  -2.2  -2.5  -1.7  -1.4  -0.8   1.1   1.0   0.2  -1.3  -1.3  -0.1   1.4
1942  -0.3  -1.6  -3.1  -1.7  -1.3  -0.5   0.5   2.8   2.4   0.5  -0.2  -1.0
1943   1.3   1.5   3.5   2.5   3.0   0.9  -0.2   0.9   1.2   2.7   1.8   2.0
1944   1.0  -0.4  -1.3  -1.3  -0.1  -1.0  -0.7   0.2   2.5   2.0   1.8  -0.5
1945   0.8   0.5   1.2  -0.7  -1.6   0.2   1.0   1.1  -0.5  -3.0  -3.6  -1.5
1946  -0.2   0.7   1.1   0.7   2.0   0.9   3.5   2.8  -0.4  -1.6  -0.8   0.3
1947  -1.8  -3.7  -3.1  -0.5   2.2   0.2   0.2   1.6   0.9  -0.3  -2.3  -1.5
1948  -0.8   1.1   1.5   2.2   0.8  -0.7  -0.6  -0.3   1.0  -0.2  -0.5  -0.5
1949   1.3   1.4   2.1   1.1   0.8  -1.4  -1.9  -1.5  -0.8   0.8   1.1   1.0
1950   1.0   0.8   1.6   0.0  -0.1  -1.4   0.7   2.5   2.8   1.6  -0.3  -0.1
1951   0.9   0.3  -0.9  -3.1  -3.5  -2.7  -0.5   1.1   2.0   0.9   2.0   2.5
1952   1.5  -0.6  -1.2  -1.3   0.3  -1.0   0.0  -1.1  -1.3  -2.2  -1.5  -2.0
1953  -0.7   0.0  -0.3  -1.4  -1.8   0.9   2.8   2.8   2.6   3.0   2.4   1.7
1954   1.5   1.3   1.8   0.3   0.4   1.0   2.0   2.7   1.8   3.0   2.5   0.5
1955  -1.7  -3.4  -2.6  -1.5   0.4   0.5   1.2   3.5   1.4  -1.4  -2.7  -2.3
1956  -2.0  -1.3  -1.7   1.6   2.0   3.1  -0.5  -1.4  -0.2   1.4   2.2   2.8
1957   1.2  -0.4  -1.3  -0.7  -0.5  -2.3  -2.2  -1.6   1.1  -0.7   0.9  -0.6
1958  -1.1  -2.8  -2.4  -1.4  -0.2  -2.4  -2.4  -2.0   0.3   1.7   1.1  -1.6
1959  -1.2   0.0   2.3   1.5   1.0   1.3   1.5   0.6   0.9   1.6   2.4   0.3
1960  -2.2  -3.2  -2.1   0.2   1.3   1.1  -0.6   0.0  -2.6  -0.8   0.2   1.9
1961   2.0   1.1   0.3  -0.9   0.0   1.2   2.7   2.1   2.8   1.8  -1.9  -1.0
1962  -0.2  -0.4  -1.6  -3.1   0.0  -1.4  -0.9  -1.0   0.1  -0.5  -0.9  -3.9
1963  -4.0  -2.9  -0.7   2.3   1.3   1.3  -1.9   0.4   2.5   1.2  -1.1  -2.8
1964  -2.8  -2.2  -1.3   0.3   1.6   1.7  -0.8  -1.2  -0.8   0.7   0.8   0.1
1965  -2.2  -2.7  -1.9   0.4   2.3  -0.3   0.5  -0.3  -0.3  -1.7  -0.9  -2.7
1966  -3.1  -3.0  -1.9   0.7   0.9   2.2  -0.6  -1.9  -4.0  -2.0  -0.1   0.3
1967   0.8   1.0   2.5   1.9   1.2   0.7   1.1   0.0   1.5   2.0   0.9   0.3
1968  -1.1   0.1  -0.9   0.0  -1.6  -2.0  -2.1  -2.8  -3.0  -3.6  -3.1  -3.6
1969  -4.3  -4.7  -3.0  -1.7   0.4  -0.2   0.3   1.4   1.0   0.7   0.7  -1.4
1970  -0.3  -1.5   0.4   0.4   2.0   1.4  -0.1  -0.2  -0.5  -0.2  -1.1  -1.5
1971  -0.8   0.0   0.1   0.2  -0.9  -0.4  -0.9  -0.9  -0.3  -0.2   0.9   1.2
1972   0.9   1.1   1.5   2.6   3.9   3.1   1.6  -2.1  -2.4  -1.3   1.0   1.7
1973   2.4   1.9   0.8  -1.4  -1.8   0.7   1.7   0.4  -0.6  -1.6  -1.1   0.8
1974   1.9   2.0   0.8   0.0  -0.8  -0.2  -0.1   1.0   0.3   0.9   1.4   2.1
1975   1.2   0.2  -0.5  -0.6  -0.8  -1.3  -0.9   0.8   0.1   1.1  -0.1   0.7
1976   0.8   2.1   2.2   3.0   2.1   0.8  -2.1  -5.3  -2.2  -0.3  -0.2  -1.8
1977  -2.7  -1.7  -0.7  -0.2  -0.5  -0.9  -1.0  -0.6  -0.1  -0.4  -0.9  -0.1
1978  -1.6   0.5  -1.1   1.8   0.1   0.6  -1.4  -1.9  -0.8   1.8  -0.5  -2.0
1979  -3.4  -1.3  -0.5   0.1  -0.8   0.5   0.6   0.5   0.4   1.2   1.6   0.2
1980   0.0  -0.6   0.2  -1.0  -0.8  -1.4  -1.1  -0.8  -1.0  -2.0  -1.1   0.2
1981   1.9   0.6  -0.3  -1.4  -1.6  -0.3  -0.1   0.8   0.2  -0.5  -1.2  -2.0
1982  -0.5   1.4   2.2   1.9  -1.4  -1.3  -0.8   1.2   2.0   2.4   3.2   4.0
1983   1.9   1.7  -0.1   0.7  -0.7  -0.1   0.9  -0.6   1.0  -2.1  -0.8   0.6
1984   2.9   1.7  -0.5  -1.3   0.2   0.5  -0.3  -0.3   1.3   1.2   1.6  -0.8
1985  -1.7  -2.0  -0.6   0.2  -1.3  -1.4  -0.3  -0.3  -0.6  -2.7  -2.1  -0.1
1986  -0.7   1.5   0.4   3.9   1.7   2.1  -1.2  -3.5  -0.6   3.0   4.4   0.3
1987  -1.4  -2.2  -0.3  -0.5  -1.2  -1.8  -2.3  -1.6  -0.8   0.4  -0.9  -0.4
1988  -0.2   1.1  -0.2  -0.7  -1.7   0.3   1.4   1.5  -0.2  -2.2  -1.6   0.8
1989   3.4   4.5   4.2   2.9   0.2  -0.7   0.3   0.8   1.4  -0.6  -2.3  -0.5
1990   1.9   4.4   4.5   2.5   1.6  -0.7   1.0   0.1   0.3  -0.8   0.3   0.5
1991   1.2   0.6   0.7   0.8   0.9  -0.4  -0.3  -0.1   0.2   0.7   0.8   0.2
1992   0.7   1.5   3.2   2.5   1.3   0.1   1.0   0.9  -0.1   0.6   1.3   2.9
1993   1.9   1.8   1.4   0.1  -1.1  -2.5  -0.4  -1.9  -1.9   0.1   2.5   3.7
1994   2.0   2.9   2.6   3.6   1.5   1.3   1.2  -0.2  -1.3  -0.7   0.5   1.8
1995   2.8   2.9   1.8   0.1  -2.7  -2.1  -2.1  -0.7  -0.3  -2.0  -3.9  -4.4
1996  -2.1  -1.6  -1.3  -3.2  -1.4  -0.2   1.2   0.5   1.1   1.5  -0.9  -2.9
1997  -0.8   1.3   2.4  -0.8  -3.7  -2.4  -0.9   0.4  -1.8  -1.9  -1.4  -0.7
1998  -0.2   0.2   1.0   0.6  -0.1  -0.6   0.3  -0.4   0.3   0.4   1.8   2.0
1999   2.7   2.0   1.6   0.4   0.9   0.2  -1.3  -1.3  -0.2   1.2   1.6   1.4
2000   2.6   1.9   1.3  -0.4  -1.2  -0.6  -1.4  -0.9   3.3   2.8   0.8  -1.2
2001  -1.3  -1.1  -0.6  -0.8  -0.4  -1.5  -0.6  -1.2  -0.5   0.4  -1.2  -1.1
2002  -0.5   1.6   2.5   2.5   3.5   2.9   2.1  -1.6  -3.2  -2.3  -1.7  -0.4
2003  -0.2   1.1   0.3   0.1  -0.6   1.2  -1.0  -1.1  -1.7   0.1  -0.3   0.2
2004  -1.1   0.0   0.6   2.3   0.9  -0.4  -1.8   0.2  -0.9  -0.4   0.5   1.9
2005   1.4  -1.3  -2.0  -2.8  -1.4  -2.8  -99.  -99.  -99.  -99.  -99.   0.9
2006  -0.2  -0.7  -1.1  -1.1   0.2  -0.5  -0.5  -0.7  -2.1  -0.9   0.7   2.3
2007   1.4   1.9   1.6   3.4  -0.2  -0.5  -2.5  -0.6   0.5  -0.3   0.3   0.8
2008   1.4   1.7   0.1  -1.1  -3.4  -1.9   0.2   0.4   2.4   2.4   2.0   1.6
2009   0.8   1.3   1.6   3.3   0.9  -2.0  -2.8  -0.4  -99.  -99.  -99.  -99.

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Annual Station Based NAO Index

Annual index of the NAO based on the difference of normalized sea level pressures (SLP) between Ponta Delgada, Azores and Stykkisholmur/Reykjavik, Iceland since 1865. (Missing Value = -99.)

Note: As of April 2003, the Ponta Delgada station that was used in the construction of this timeseries stopped reporting. To allow this timeseries to be updated, we have started to use the nearest NCEP/NCAR Reanalysis grid point as a substitute. The following timeseries uses Ponta Delgada observational data from Jan. 1865 - Mar. 2003, and NCEP/NCAR Reanalysis data from Apr 2003 to present. The correlation between a monthly timeseries constructed with the Ponta Delgada observational data and one constructed with NCEP/NCAR Reanalysis data is .99 (1948-2003).

        00     01     02     03     04     05     06     07     08     09     

1860   -99.   -99.   -99.   -99.   -99.  -0.66  -0.20  -3.04   4.14   0.42
1870  -2.77  -0.85  -0.83   0.17   2.32  -2.10  -1.85  -0.24  -4.03  -0.69
1880  -1.86  -2.84   2.06   1.73   1.38  -1.40   0.20  -3.05  -2.94   2.57
1890   2.97  -0.34  -2.49  -1.32   2.28  -3.41   1.58   0.38   0.95  -2.40
1900   0.22  -0.78  -2.61   1.69   1.46   1.12   2.29   2.36   2.51  -0.87
1910   1.62   0.99   0.11   2.85   2.40  -2.66  -0.60  -2.21   0.45  -0.47
1920   2.97   2.32   2.21   2.43  -0.02   0.18  -0.31  -0.49   1.43  -0.51
1930   1.46  -0.48  -0.60  -0.21   1.91   1.90  -1.00  -0.81   3.75  -0.66
1940  -1.78  -2.10  -0.84   3.31   0.71  -1.69   1.62  -2.73   0.68   1.53
1950   1.10   0.49  -1.54   1.50   3.26  -2.79   0.54  -0.51  -2.12   1.83
1960  -1.88   0.47  -1.05  -2.16  -1.04  -1.77  -2.54   1.67  -2.97  -2.58
1970  -1.08  -0.08   2.05   0.27   2.18   0.01   0.59  -2.08  -0.42  -0.23
1980  -1.58  -0.55   2.63   0.38   2.17  -3.09   3.14  -3.01  -0.13   2.38
1990   3.88   1.14   2.54   1.71   2.86  -1.11  -2.00  -0.93   1.03   2.25
2000   1.18  -1.91   0.99   0.07   0.70   -99.  -0.20   1.34   1.24   -99.

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Winter (Dec-Mar) PC Based NAO Index

The normalized DJFM PC values are given in the table below. (Missing Value = -99.) Note: The NAO PC index value for year N refers to an average of December year N-1 and January, February, and March year N. (Example: The 1920 value contains the average of December 1919 and January, February, and March 1920.)

         00     01     02     03     04     05     06     07     08     09
				 
1890   -99.   -99.   -99.   -99.   -99.   -99.   -99.   -99.   -99.  -0.65
1900  -1.35  -0.32  -0.67   1.38  -0.03   0.85   0.86   1.11   0.54  -0.50
1910   0.43   0.48  -0.42   1.42   0.51  -0.70  -0.21  -1.17   0.06  -0.87
1920   1.58   0.71   0.59   0.36  -0.63   1.10  -0.27   0.50   0.16  -0.58
1930   0.43  -0.68  -0.03  -0.08   0.97   0.09  -1.94  -0.14   0.57  -0.13
1940  -2.01  -1.26  -1.11   0.67   0.64  -0.12  -0.30  -1.97   0.32   1.12
1950   0.50  -1.00  -0.12   0.01   0.17  -1.24  -1.06   0.07  -1.27   0.14
1960  -1.90   0.79  -0.93  -1.32  -0.82  -0.78  -1.64   0.66  -0.11  -2.66
1970  -1.22  -0.68   0.14   1.29   0.39   0.84   1.34  -1.42  -0.57  -1.49
1980  -0.35   0.34  -0.21   1.40   0.42  -0.86  -0.04  -0.68  -0.19   2.62
1990   2.09   0.61   1.94   1.91   0.87   1.38  -1.48   0.79   0.02   0.67
2000   1.73  -1.05   0.71   0.09  -0.10   0.45  -0.94   1.25   1.13   0.04

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Monthly PC Based NAO Index

The normalized monthly PC values are given in the table below. (Missing Value = -99.)

        J     F     M     A     M     J     J     A     S     O     N     D
1899   -0.07  -0.71  -1.05  -0.41  -0.61   0.13   0.21  -0.62   0.51   0.18   0.63  -1.07
1900    0.35  -2.57  -1.35   0.56   0.04  -0.27  -0.41  -0.22   0.74   0.14   0.13   0.82
1901    0.27  -2.09  -0.42   0.33  -0.49   0.40  -0.06   0.13  -0.08   0.32  -0.93  -0.38
1902    0.27  -2.41  -0.15  -0.83   0.07  -1.36  -0.61  -0.67  -0.56   0.19  -0.22   0.42
1903    0.23   2.27   2.28  -0.52   0.26  -1.35  -0.51  -0.09  -0.29  -0.61   0.66  -0.18
1904    0.89   0.11   0.13   1.68   0.50  -0.12  -0.23  -0.37  -0.07   0.43  -0.26  -0.15
1905    0.89   1.19   1.20  -0.89   0.64  -0.07   0.06  -0.14   0.11  -0.82   0.01   0.96
1906    1.05   0.72   0.35   0.89  -0.96  -0.59   0.34  -0.64   0.02   0.55  -0.96   0.44
1907    0.64   1.12   1.79   0.00  -1.09  -0.18  -1.15  -0.04   0.10  -0.26   0.52  -0.09
1908    0.75   0.78   0.81  -0.56   0.43   0.13  -0.22  -0.15   0.20  -0.19   0.00   0.40
1909    0.60  -0.31  -2.34   0.22  -1.19  -0.51   0.59   0.47  -0.53  -0.05  -0.65  -1.64
1910    1.05   1.59   0.96  -0.44   0.10  -0.39  -0.47  -0.68  -0.06  -0.13  -2.43  -0.36
1911    0.84   0.95   0.41   0.18   0.91  -0.05  -0.33  -0.21   0.28  -0.29   0.46   0.49
1912   -0.84  -1.57   0.98   0.80   0.60  -0.34  -0.45  -0.61  -0.84   0.30   0.67   1.66
1913    0.53   0.78   2.94   0.86   0.19   0.69  -0.18   0.14  -0.45  -0.51   1.69   0.56
1914   -0.22   1.12   0.28   1.44   1.50   0.78  -0.36   0.04  -0.10   0.12   0.35   0.82
1915   -0.60  -0.30  -2.25   1.35  -0.88  -0.81  -0.36  -0.71  -1.08  -0.60  -1.87  -1.64
1916    1.80   1.09  -2.01  -0.19  -0.58  -0.56   0.27  -0.09  -0.33   1.00  -0.10  -2.24
1917   -1.51   0.04  -0.48  -1.10  -1.12   0.33  -0.39  -0.22   0.94   0.49   0.76  -0.66
1918   -2.23   2.09   0.54  -0.31   0.47   0.63  -1.02   0.08   0.27   0.34  -0.02   0.13
1919   -0.63  -2.17  -0.45   0.52  -0.19   1.10  -0.05   0.69   0.50  -0.80  -1.19   1.11
1920    1.30   1.25   2.60  -1.05   0.53  -0.08   0.98   0.13   0.00  -0.71   1.11  -1.06
1921    0.91   0.40   2.42   0.14   0.70   0.20   0.00   0.20   0.09   0.21  -0.53   1.32
1922   -0.42   1.44   0.32  -0.43   0.70   1.12   0.33   0.18   0.06  -1.43  -0.06   0.93
1923    0.78  -0.06   0.14  -0.08  -0.11   0.50   0.53  -0.23   0.60   0.95  -0.14   0.48
1924    0.45  -0.72  -2.42  -1.05  -0.06  -0.23   0.38   0.24   0.45   0.02   0.30   1.60
1925    1.53   1.24  -0.34   0.77   0.08   0.36   0.04   0.17   0.26  -0.47  -0.90  -1.30
1926    0.08   0.02   0.40   0.37  -0.96  -0.62   0.16  -0.02   0.14  -1.23   0.51  -0.29
1927    1.15   0.34   0.88   0.49  -0.42   0.02   0.00  -0.07  -0.59  -0.80   0.38  -2.08
1928    2.18   1.84  -0.66   0.16  -0.91  -0.67   0.61  -0.28  -0.01   0.47   0.49   0.49
1929   -2.30  -0.48   0.29  -0.75   0.44  -0.26   0.09   0.00   0.48   0.87   0.43   1.47
1930    1.22  -0.12  -0.40  -0.63   0.43   0.55  -0.31  -0.42  -1.32   0.07   0.91   0.43
1931   -0.42   0.28  -2.46   0.28  -0.35  -0.41   0.06  -0.41  -0.51  -0.04   0.84   0.50
1932    1.31  -1.26  -1.37  -0.15  -0.60  -0.50  -0.33   0.30   0.17   0.23   0.63   1.11
1933    0.82  -1.43  -0.31  -0.66  -0.32   0.04   0.41   0.66  -0.55  -0.65  -0.14  -0.16
1934    1.62   1.33   1.02  -0.67   1.14  -0.72  -0.25   0.20   0.08   0.33   0.01  -0.90
1935   -0.04   1.79  -0.22  -1.18  -0.84   0.04   0.79   0.18  -0.36   1.31   0.43  -1.53
1936   -2.04  -2.27  -1.06  -0.09   0.04   0.23  -0.17   0.44  -0.49   1.01   1.00   1.74
1937    0.67  -0.50  -1.96  -0.03   0.55   0.53  -0.17   0.41   0.52  -0.09  -1.01  -1.21
1938    0.94   0.26   1.75   0.46   0.12   0.88   0.47   0.27   0.46   1.37   1.18  -0.34
1939   -1.38   1.62   0.15  -0.05   0.05  -0.16  -0.33  -0.01  -1.12  -0.48   0.46  -1.14
1940   -3.12  -1.82  -1.64  -0.49  -0.38   0.22  -0.15   0.72   0.29  -0.65   0.72   0.30
1941   -2.40  -1.51  -1.16  -0.58   0.23   0.40   0.49  -0.22  -0.40  -0.23  -0.29   0.55
1942    0.12  -3.07  -1.66  -0.27   0.27  -0.39   0.33   0.36   0.79   0.19  -0.40   0.34
1943   -0.98   2.34   0.88   2.29   0.60   0.00   0.02  -1.21   0.17  -0.19   0.13   1.06
1944    1.49  -0.23  -0.45  -0.30   0.89  -0.15  -0.80   0.34   0.49   0.61  -0.89   0.29
1945   -2.77   1.12   0.75  -0.22  -0.05  -0.32  -0.24   0.24   0.11  -0.23  -1.30  -1.62
1946    0.94  -0.34  -0.03   1.13  -0.70   0.80   0.83   0.07   0.39  -0.68  -0.46   0.33
1947    0.05  -5.12  -1.90   2.46   0.06  -0.15   0.64   0.12   1.13   0.20  -2.01  -1.61
1948   -0.17   0.62   2.28   0.67  -0.20  -0.44  -0.35  -0.01   0.17   1.00   0.15  -0.12
1949    1.26   2.54   0.02   1.32  -0.28  -0.45  -0.22   0.10  -0.40   0.60  -0.23   0.61
1950   -0.07   0.91   0.62   0.56  -0.37   0.54  -0.65  -0.10   0.87   0.39  -0.65  -1.41
1951    0.25   0.21  -2.28  -0.55  -0.70  -0.92   0.45   0.09  -0.38   0.24  -0.17   2.01
1952    0.86  -1.31  -2.43   0.74  -1.22   0.13   0.47   0.00  -0.35  -0.35  -1.19  -1.30
1953   -0.02   0.21   0.65  -1.25  -0.39   0.08   0.50   0.32   0.28   0.83   1.74   1.18
1954   -0.15   0.51  -0.16   0.54  -1.28   0.27   0.26  -0.32   0.40   1.05   1.00   1.15
1955   -2.68  -1.99  -1.54  -0.18   0.09  -0.42   0.71   0.57   0.82  -0.61  -2.00  -0.77
1956   -1.52  -1.89   0.41  -1.00   2.20   0.32  -0.58  -0.44  -0.34   0.97   0.69   1.24
1957    2.05  -1.13  -1.84   0.35  -0.51  -0.67  -0.69   0.41  -0.68   1.87  -0.80   0.67
1958   -0.87  -1.95  -3.15   0.23   0.05  -1.02  -0.58  -1.01  -0.30   0.61   0.36  -1.01
1959   -2.28   2.54   1.20   0.09  -0.20   0.17   0.45  -0.39   0.08   0.43  -0.38   0.06
1960   -2.43  -2.84  -1.58   0.16  -0.43   0.07  -0.13  -0.88  -0.02  -1.83  -0.30   0.77
1961   -0.08   1.23   0.84  -1.07   0.23   1.48   0.04   0.83   0.76   0.33  -0.53  -2.48
1962    1.92   0.33  -3.89   0.71  -0.12   0.35  -1.11   0.41  -0.08   0.41  -0.52  -0.28
1963   -3.10  -1.70   0.33  -1.10   1.59  -0.56  -0.43  -0.14   0.78   1.16  -0.90  -1.38
1964    0.04  -0.72  -0.95   0.37   0.67   0.38   1.22  -1.09   0.00   0.49  -0.13   0.06
1965   -0.52  -2.02  -0.92   0.72  -0.57   0.45  -0.18   0.21  -0.13   0.18  -1.72  -0.17
1966   -3.81  -2.09  -0.19  -1.50   0.67   0.45   0.38  -0.97   0.12  -1.64   0.24   0.03
1967   -1.48   1.60   2.37   0.63  -0.32   1.29   0.26   0.37   0.38   1.18   0.75  -0.91
1968   -0.32  -1.53   1.55  -0.28  -0.72   0.28  -0.68  -0.40  -1.21  -1.57  -1.59  -1.42
1969   -3.33  -2.81  -2.18   0.58  -0.41  -0.09   0.45  -0.75   0.55   0.77   0.33  -0.82
1970   -2.61   0.26  -1.17  -0.20   0.65   0.79   0.43  -0.27   0.20  -0.19  -0.27  -0.99
1971   -1.17   0.41  -1.07  -0.96   0.70  -0.94  -0.27   1.05  -0.06   0.47  -0.08   0.58
1972    0.28  -0.06   0.52   0.13   0.62   0.70  -0.15   0.39  -0.57   0.11   0.47   1.65
1973    0.84   1.38   0.93  -1.19  -0.06   0.61   0.21   0.27  -0.05  -0.48  -0.60   0.16
1974    1.77   0.04   0.16   0.19  -0.66  -0.28   0.55  -0.08   0.55  -0.32  -0.08   1.25
1975    1.37   0.36  -0.25  -0.21  -0.57  -0.29   0.76  -0.13   1.25  -0.43   0.40   0.93
1976    0.50   1.97   1.67   0.13   0.54   0.44  -0.29   0.62  -1.01  -0.49   0.38  -1.41
1977   -2.52  -1.24  -0.08   0.86  -0.22  -0.20  -0.19  -0.81   0.04   0.40   0.97  -0.64
1978    0.73  -3.55   1.50  -1.45   0.28   0.65  -0.53  -0.02   0.13   0.85   2.47  -2.37
1979   -2.39  -1.31   0.87  -1.29  -0.01   0.77   0.36   0.09   0.47  -0.72   0.59   1.24
1980   -1.71   0.24  -0.67   0.36  -1.18   0.21  -0.62  -0.74   0.57  -0.72  -1.43   1.10
1981    0.53   0.92  -1.77  -0.05   0.16  -0.37   0.60   0.30  -0.92  -0.60   0.14  -2.17
1982   -1.45   1.18   1.93   0.95  -0.03  -1.21   0.42   0.55   0.60  -0.18   1.98   2.01
1983    2.57  -1.09   0.85  -0.99  -0.37   0.57   0.31   0.95  -0.34   1.39  -1.25   0.63
1984    2.09   0.78  -1.67  -0.33   0.45   0.20   0.13   0.64  -0.01   0.55  -0.38   1.34
1985   -2.74  -1.31  -0.03   0.18  -0.54  -0.51   0.13   0.13  -0.20   0.76  -1.25  -0.94
1986    1.00  -2.83   3.15  -0.61   0.62   0.54   0.12  -0.75  -0.49   2.19   1.64   1.38
1987   -1.57  -1.49  -0.94   0.96   0.31  -0.58  -0.09  -0.84  -0.07   0.07   0.19  -1.29
1988    0.49   0.24  -0.06  -1.41  -0.12   0.35  -0.03   0.41   0.22  -0.24  -0.27   1.33
1989    2.69   3.23   2.18  -0.28   0.92   0.00   0.67   0.70   0.85   0.70  -0.27  -0.84
1990    2.09   3.26   3.14   1.94  -0.19   0.29  -0.01   0.44   0.12   0.10  -0.66   1.66
1991    1.38   0.51  -0.79   0.33   0.63  -0.15  -0.23   1.05   0.24  -0.57   0.77   1.55
1992    1.11   2.03   1.79   0.30   0.75  -0.33   0.05   0.65  -0.18  -1.00   1.81   1.26
1993    3.11   1.10   1.24   0.17  -1.54  -0.58  -0.56  -0.22  -0.53  -1.20   1.35   0.91
1994    0.54  -0.64   2.50   0.79  -0.22   1.58   0.54   0.31  -0.50  -0.82   0.46   1.39
1995    0.46   1.95   0.80  -1.06  -0.80  -0.09  -0.06   0.08  -0.20  -0.45  -1.26  -2.42
1996   -1.37   0.00  -1.18  -0.93  -0.51   0.49   0.73   0.07  -0.91   0.07   0.40  -2.14
1997   -0.58   3.14   2.08  -0.32  -0.50  -1.07  -0.15   0.29   0.22  -1.28  -1.14  -0.49
1998   -1.03   0.58   0.60  -0.43   0.30  -0.97   0.02   0.63  -1.92   0.39  -0.49   1.53
1999    0.70   1.11  -0.86  -0.33   0.43   1.02   0.01  -0.45  -0.21  -0.11   0.99   1.07
2000    1.13   2.93   0.32  -0.61   0.81   0.23  -0.59   0.30   0.47   0.90  -1.07  -1.47
2001   -0.29  -0.30  -1.94   0.51   0.14  -0.33  -0.16   0.55  -0.85   0.57   1.25  -1.54
2002    1.22   1.49   0.82   0.54   0.37   0.60   0.45  -0.24  -0.85  -1.51  -0.58  -1.36
2003   -0.14   0.97   1.13  -0.53   0.78  -0.11  -0.21  -0.26   0.30  -0.62   0.29  -0.10
2004   -1.25  -0.44   0.90   0.44   0.28  -0.26   0.40  -0.49   0.71  -1.06  -0.07   2.01
2005    1.45  -0.69  -1.77  -0.11  -0.36  -0.22   0.06   0.38   0.16  -0.86   0.46  -0.63
2006    0.57  -1.15  -2.35   0.86  -0.44   0.91   0.34  -0.58  -0.33  -1.95   0.82   2.25
2007    1.56  -1.25   1.81   0.29   0.88  -0.95  -0.26  -0.11   0.06   0.32  -0.10   1.17
2008    0.82   1.53   0.53  -1.29  -1.34  -0.76  -0.46  -0.03   0.10   1.20   0.19   0.60
2009    0.57  -1.03   0.28   0.44   1.52  -1.29  -1.07  -0.07   1.02  -1.49   0.44  -3.02

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DJF PC Based NAO Index

The normalized PC values are given in the table below.(Missing Value = -99.)

         00     01     02     03     04     05     06     07     08     09

1890   -99.   -99.   -99.   -99.   -99.   -99.   -99.   -99.   -99.  -0.53
1900  -1.26  -0.22  -0.72   0.99  -0.08   0.81   0.86   0.83   0.50   0.19
1910   0.20   0.50  -0.88   0.72   0.53  -0.27   0.40  -1.27   0.02  -0.98
1920   1.12   0.12   0.52   0.41  -0.03   1.37  -0.62   0.39   0.41  -0.87
1930   0.55  -0.08   0.48  -0.02   0.99   0.13  -2.02   0.41   0.10  -0.25
1940  -1.99  -1.18  -0.77   0.53   0.93  -0.43  -0.32  -1.91  -0.41   1.45
1950   0.34  -0.54   0.69  -0.25   0.31  -1.00  -1.31   0.63  -0.50  -0.15
1960  -1.73   0.47   0.08  -1.64  -0.59  -0.63  -2.06  -0.02  -0.60  -2.46
1970  -1.16  -0.46  -0.01   1.23   0.50   1.13   1.29  -1.78  -1.13  -2.09
1980  -0.15   1.07  -0.87   1.50   1.09  -1.01  -0.99  -0.48  -0.24   2.59
1990   1.36   1.03   1.83   1.99   0.19   1.41  -1.38   0.24  -0.19   1.13
2000   1.93  -0.69   0.62  -0.31  -0.34   1.17  -0.41   0.94   1.20  -0.09

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MAM PC Based NAO Index

The normalized PC values are given in the table below.(Missing Value = -99.)

         00     01     02     03     04     05     06     07     08     09

1890   -99.   -99.   -99.   -99.   -99.   -99.   -99.   -99.   -99.  -1.21
1900  -0.37  -0.25  -0.46   1.05   1.32   0.59   0.15   0.32   0.49  -1.74
1910   0.37   0.97   1.33   2.25   1.71  -1.13  -1.45  -1.57   0.55  -0.09
1920   0.99   1.78   0.22   0.07  -2.04   0.31  -0.19   0.37  -0.57   0.07
1930  -0.26  -1.24  -1.18  -0.77   0.99  -1.23  -0.32  -0.74   1.13   0.23
1940  -1.38  -0.72  -0.82   1.96   0.07   0.17   0.38   0.32   1.44   0.55
1950   0.40  -1.91  -1.60  -0.62  -0.35  -0.95   0.90  -1.10  -1.59   0.63
1960  -0.90  -0.24  -1.77   0.42   0.11  -0.46  -0.59   1.30   0.25  -0.97
1970  -0.49  -0.57   0.68  -0.29   0.02  -0.59   1.35   0.25   0.18  -0.30
1980  -0.72  -0.93   1.45  -0.40  -0.68  -0.12   1.65   0.17  -0.86   1.54
1990   2.48   0.10   1.45  -0.02   1.53  -0.77  -1.19   0.48   0.24  -0.46
2000   0.24  -0.76   1.06   0.75   0.94  -1.34  -1.12   1.48  -1.07   1.25

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JJA PC Based NAO Index

The normalized PC values are given in the table below.(Missing Value = -99.)

         00     01     02     03     04     05     06     07     08     09
	 
1890   -99.    -99.  -99.   -99.   -99.   -99.   -99.   -99.   -99.   0.18
1900  -0.71   1.05  -2.24  -2.23  -1.24  -0.11  -0.80  -2.10  -0.14  -0.40
1910  -1.91  -0.61  -1.59   0.56   0.17  -1.65  -0.48  -0.57  -0.67   0.87
1920   0.76   0.07   0.36  -0.37  -0.18   0.44  -0.37  -0.48  -1.12  -0.67
1930  -0.65  -0.99   0.00   0.98  -0.47   0.65   0.42   1.33   1.00   0.02
1940   0.54   0.68   0.30  -1.51  -0.15  -0.55   0.75   1.04  -0.80   0.14
1950  -0.43  -0.18   0.37   0.65  -0.39   2.03  -0.96  -0.72  -2.46   0.47
1960  -0.97   1.34  -0.69  -0.77   0.67  -0.07   0.11   1.71  -0.03   0.45
1970   1.20   0.03   1.35   1.12  -0.22   1.04   1.59  -0.76   0.08   1.09
1980  -1.01   0.98  -0.16   2.26   1.12  -0.56   0.40  -1.10   0.65   1.66
1990   0.62   0.75   0.27  -1.25   2.16   0.91   1.34   0.14  -0.74   1.10
2000  -0.07  -0.07   0.83  -0.34  -0.33   0.67   1.22  -1.16  -1.34  -2.12

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SON PC Based NAO Index

The normalized PC values are given in the table below.(Missing Value = -99.)

         00     01     02     03     04     05     06     07     08     09

1890   -99.    -99.  -99.   -99.   -99.   -99.   -99.   -99.   -99.   1.27
1900   0.25  -0.69  -0.89  -0.23  -0.29  -0.48  -0.54  -0.15  -0.65  -0.64
1910  -1.83   0.11  -0.31   0.52  -0.13  -2.68   0.24   1.77   0.51  -1.09
1920  -0.52  -0.95  -1.08   1.78   0.37  -0.38  -0.14  -0.44   0.39   1.39
1930   0.23  -0.16   1.21  -1.28   0.45   1.23   0.67  -0.33   1.89  -1.11
1940   0.58  -1.57   0.50   0.08   0.49  -1.39  -0.59  -0.45   1.08  -0.37
1950   0.92  -0.25  -1.08   1.52   1.81  -0.91   0.69   0.46  -0.33  -0.45
1960  -1.55   0.60  -0.07   0.95   0.12  -1.14  -0.45   1.88  -2.97   1.88
1970   0.32   0.23   0.10  -0.81   0.24   0.47  -1.02   1.20   2.19   0.30
1980  -0.89  -0.35   1.77   0.54   0.27  -0.57   2.23  -0.14  -0.24   0.64
1990  -0.10   0.65   0.41  -1.45  -0.46  -1.14   0.04  -1.07  -1.19   0.53
2000   0.39   0.72  -2.18  -0.10   0.15   0.00  -0.28   0.04   1.28 -99.00

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Annual PC Based NAO Index

The normalized PC values are given in the table below.(Missing Value = -99.)

         00     01     02     03     04     05     06     07     08     09
1890   -99.   -99.   -99.   -99.   -99.   -99.   -99.   -99.   -99.  -0.60
1900  -0.40  -0.63  -1.27   0.53   0.67   0.78   0.22   0.35   0.63  -1.13
1910  -0.26   0.93   0.25   1.77   1.44  -2.19  -0.40  -0.69   0.27  -0.37
1920   1.25   1.40   0.68   0.72  -0.09   0.27  -0.23  -0.08   0.98   0.19
1930   0.15  -0.60  -0.15  -0.44   0.74   0.06  -0.37  -0.43   1.73  -0.37
1940  -1.41  -1.12  -0.73   1.11   0.21  -1.10   0.53  -1.27   0.81   1.02
1950   0.10  -0.43  -1.51   0.94   0.70  -1.85  -0.07  -0.25  -2.06   0.47
1960  -2.10   0.35  -0.55  -1.16   0.10  -1.11  -1.99   1.27  -1.81  -1.90
1970  -0.92  -0.39   0.98   0.28   0.69   0.68   0.78  -0.82  -0.31  -0.41
1980  -1.10  -0.90   1.54   0.55   0.82  -1.39   1.35  -1.23   0.16   2.43
1990   2.71   1.06   1.79   0.67   1.36  -0.83  -1.16   0.11  -0.34   0.63
2000   0.68  -0.59   0.29   0.36   0.14  -0.69  -0.26   0.66   0.11   -99.

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DJFM PC Based NAM Index

The normalized PC values of the DJFM 20-90N SLP EOF1 are given in the table below. (Missing Value = -99.)

         00     01     02     03     04     05     06     07     08     09
	 
1890   -99.   -99.   -99.   -99.   -99.   -99.   -99.   -99.   -99.  -0.28
1900  -2.00   0.13  -0.51   1.72  -0.21   0.82   0.39   0.82   0.03  -0.78
1910   0.24   0.51  -0.58   1.27   1.02  -0.98  -0.08  -0.82   0.08  -0.95
1920   1.30   0.55   0.34   0.51  -0.84   0.86  -0.21   0.14   0.15  -0.83
1930   0.49  -1.27   0.52  -0.50   0.72   0.50  -2.46   0.04   0.51  -0.18
1940  -1.68  -1.00  -0.76   0.75   0.55  -0.83  -0.43  -2.11   0.75   1.35
1950   0.36  -1.08  -0.01  -0.06   0.27  -1.11  -0.99  -0.13  -0.86   0.50
1960  -1.54   0.39  -0.31  -0.62  -0.30  -0.78  -1.08   0.25   0.11  -2.63
1970  -1.77  -0.63   0.11   1.34  -0.33   0.87   0.99  -1.86  -0.40  -0.91
1980  -0.70  -0.02   0.22   0.86  -0.34  -1.06  -0.48  -0.66  -0.30   2.87
1990   2.08   0.48   1.85   2.16   0.69   1.17  -1.07   1.31   0.19   0.68
2000   1.58  -0.67   1.40   0.41   0.24   0.07  -0.82   1.61   1.28   0.42

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Monthly North Pacific Index

Monthly NP values (-1000 mb)  Jan 1899 - Apr 2008 (Missing Value = -99.)

        J     F     M     A     M     J     J     A     S     O     N     D

1899   9.9   9.3   9.8  14.8  14.6  16.8  17.8  18.0  13.9  14.5   2.7   7.4
1900   6.6   6.3   5.1  13.1  12.5  12.5  15.9  16.5  14.9  13.8  12.1   4.3
1901   8.9  12.1  12.5  21.2  16.5  14.5  16.5  16.7  13.5  11.8  10.3   9.1
1902   6.0   5.1  16.9  15.1  15.5  13.9  16.8  15.8  15.3  13.1  12.1  15.6
1903  10.2  11.6  18.0  19.1  15.0  12.9  18.3  16.4  15.8  14.1  10.6   9.2
1904  11.9  16.9  17.0  15.7  14.7  17.4  16.7  19.0  16.2  14.5   9.5   9.6
1905   8.9   5.8   8.6  11.1  16.1  16.7  17.9  15.4  15.7  15.1   9.1   7.6
1906  13.7   8.5  12.5  13.0  16.0  14.0  17.3  13.1  14.6  10.6  11.8  14.4
1907  14.6  10.3  19.5  15.7  14.2  15.1  17.1  17.8  16.9  14.0  12.3   7.1
1908   8.6  11.7  19.4  15.9  15.2  16.4  16.3  17.3  15.6  11.8   6.5   7.4
1909  14.3  10.0  14.8  18.5  15.1  15.7  17.3  16.3  14.9  11.6  14.6  13.0
1910  15.6   7.9   8.3  14.2  13.1  16.2  17.9  18.6  15.2  12.9  11.0   8.6
1911  18.4  10.9  14.9  16.9  14.8  14.0  18.2  19.8  16.2  10.3  11.3   9.8
1912   4.7   5.3  16.1  12.8  13.7  15.3  17.3  15.1  13.3  13.8   8.5   8.6
1913  10.4   9.0  10.5  15.2  13.8  13.2  19.0  17.0  13.6  13.4  12.0   3.6
1914   8.9   4.1  16.8  13.6  16.9  14.9  16.5  16.6  16.8   9.9  11.6  11.2
1915  10.1  11.4   8.0  11.0  12.5  19.4  19.3  16.2  15.1  14.2  12.4  10.6
1916  18.0  10.9  12.3  14.6  18.2  16.5  18.2  16.1  15.9  16.6  15.0   8.2
1917  13.0   7.9  16.7  15.0  15.4  18.1  20.1  16.9  15.9  15.1  11.4   6.8
1918   5.1  11.3  17.0  16.9  17.2  15.7  15.5  17.2  14.1  12.2  10.7   8.1
1919   7.9   5.0  11.1  12.0  12.2  16.8  20.2  16.9  15.5  16.2  13.3   7.6
1920  12.0  10.7  16.3  17.8  17.2  13.9  16.5  16.0  14.2  12.3  11.5   7.8
1921  12.3   3.8  13.6  17.1  16.2  12.1  20.5  16.5  15.5  13.5   7.4  10.6
1922   9.2  16.4  11.4  16.9  15.2  16.7  21.5  16.5  16.9  12.3  11.8   3.3
1923  12.4  11.4  15.4  12.2  15.8  14.0  18.0  15.5  14.9   9.0   7.8  10.9
1924   5.6   6.3  11.5  17.7  14.0  16.5  17.7  16.5  13.0  14.6   8.1   7.9
1925   9.4   4.8  11.4  16.1  11.9  15.7  17.5  18.5  14.9   9.7   9.9   5.5
1926   1.4   2.8   6.1   8.8  12.9  13.7  17.5  15.4  14.8   8.0   6.4   8.9
1927   9.2   0.3  15.0  18.1  17.5  13.3  19.4  15.7  11.8  12.4  11.2  10.5
1928   5.8   5.6   9.5  13.5  13.9  15.0  17.2  17.3  16.0  12.4   6.9   4.1
1929   5.5   7.2  14.6  14.6  13.5  13.1  17.9  16.0  12.1   9.4  11.6  11.0
1930   8.4   6.7  16.9  13.0  13.9  14.6  17.2  17.6  16.2  11.2  12.2   4.0
1931  -1.3   6.4   9.8  13.4  14.1  13.7  16.8  16.5  16.2  13.2  12.7  12.1
1932  12.5  12.3   6.2  11.9  14.5  15.5  17.9  17.4  15.1  12.0  12.0   6.4
1933  12.5  11.3  11.2  14.9  16.1  15.7  19.1  15.7  14.3  11.9  12.5   9.8
1934   4.7  -1.4   7.8  13.3  14.1  16.1  19.3  17.7  13.3  12.1   9.2   8.0
1935   5.9   8.2  13.2  15.8  14.6  13.5  17.9  18.1  13.6  15.9  13.5   1.4
1936   3.2   4.9  14.5  13.1  12.8  14.2  17.7  17.7  15.2   9.6  10.4  12.2
1937  17.4  13.4  11.2  15.4  12.4  12.5  17.4  18.1  15.6   8.5  11.2   6.8
1938   8.4   7.2  11.1   9.9  14.1  14.2  18.7  19.4  13.1   8.7  11.7   5.2
1939   7.6   8.8  13.7  15.3  15.4  16.3  17.1  16.2  14.9  13.9  10.0   0.9
1940  -1.3   1.7   7.0   8.6  14.9  14.7  16.2  16.3  12.8  10.7  10.7   3.1
1941   1.0   2.4   9.5  10.1  15.6  12.7  16.0  15.9  14.0  13.2  12.2   6.8
1942   1.2   6.5  13.7  11.9  14.7  15.0  16.5  14.7  13.4  13.3  15.5  12.3
1943   7.8  10.3  15.8  10.2  15.2  15.0  16.4  17.2  13.9  10.6   6.0   6.0
1944   1.8  10.7  14.5  12.3  13.9  15.2  17.6  17.8  16.8  14.3   7.8  -99.
1945   0.4   5.0  11.1  18.4  12.5  16.2  16.2  18.6  14.5  12.9  16.1   4.1
1946   6.7   6.3  13.4  14.6  14.3  15.6  16.5  17.1  14.3  14.2  14.6  13.3
1947  12.8   1.9  10.7  13.0  12.1  14.4  16.9  18.2  16.6  10.5   7.2   9.7
1948   9.1  14.0  16.7  20.7  16.0  15.4  17.2  17.8  15.5  10.8  10.6  14.2
1949  12.0  10.9   6.9  13.5  15.5  16.6  18.8  17.0  13.1  12.4   8.1  10.5
1950  14.9  10.4   8.1  15.5  15.5  15.5  16.2  12.8  12.6  10.8  16.4   8.0
1951   8.3  11.2  15.7  11.9  12.7  14.2  17.9  16.2  12.4  11.5   9.5  13.8
1952  10.4   7.7  14.1  13.7  15.8  14.5  18.4  17.0  14.4  12.4   8.9   3.8
1953   2.5   8.2  14.6  10.4  13.4  17.1  18.2  16.7  15.7  10.5   5.9   8.1
1954  10.8   7.4  16.8  17.5  13.7  13.4  18.2  16.8  15.0  10.7   5.6  11.8
1955   7.1  15.4  16.2  16.6  14.9  15.6  17.0  18.2  16.2  13.1  13.0  11.5
1956  10.2  12.9  14.0  14.2  13.6  15.3  18.8  15.0  13.9  16.2  11.0   7.6
1957  13.8  11.3   7.9  14.9  11.9  12.8  18.6  16.3  11.7  10.7   8.6  12.4
1958   1.0   2.7  14.5  12.5  13.8  14.5  16.4  16.6  14.0  14.6  11.2   5.7
1959   8.4  13.4  12.8  16.1  15.0  14.8  18.4  17.1  12.2  10.4   9.2  10.2
1960   5.9   7.6  13.4  14.8  14.9  16.6  17.0  17.0  16.1  11.9  12.1   5.5
1961  -0.4   6.8  10.3  18.1  15.0  16.4  18.3  15.8  15.8  15.7  12.5   9.8
1962  10.1   7.7  13.3  18.5  18.2  16.8  18.3  17.1  15.6  10.9   8.5   6.7
1963   2.5   2.3  17.4  17.5  15.8  16.3  18.5  16.3  10.7  12.3  11.3   3.2
1964   6.3  10.0  14.6  19.5  20.8  13.8  16.5  16.0  15.0  14.3  12.2  10.7
1965   5.7  10.0  10.9  16.0  16.3  14.2  17.4  15.7  15.0  12.0  13.9  13.3
1966   4.2  12.8  12.2  15.6  16.2  14.0  17.6  16.3  10.3  14.3  15.4   6.7
1967   8.0   8.8  15.8  21.0  18.4  14.4  19.0  14.0  10.2  10.3  12.6  10.0
1968  10.1   0.1  12.3  17.3  16.2  16.2  15.9  15.2  15.9  10.7   6.4  13.6
1969  12.4   8.9  12.9  12.3  12.7  13.2  19.0  16.9  12.2  10.6  10.4   1.8
1970   6.0   2.6   7.9  17.1  16.9  14.6  16.1  16.8  14.3  14.5  14.3  11.9
1971  12.4   7.6  11.2  14.7  14.2  14.5  16.3  15.3  15.3  15.2  11.7  14.2
1972  12.7  10.7   9.8  19.8  14.8  15.5  18.0  14.6  14.8  14.9   9.7  10.7
1973   8.3   8.2  10.6  16.8  14.4  15.1  17.6  17.8  14.3  14.8  14.8   5.3
1974   6.6  11.2   7.4  14.5  15.5  16.0  17.1  14.6  14.4  10.7  10.5   6.1
1975  10.9   8.2  14.4  18.9  14.5  16.6  15.8  17.5  16.5  13.8  12.4   7.0
1976   4.1  13.1  13.8  15.3  14.5  15.8  15.1  15.4  11.8  12.2   7.7   5.1
1977  -1.0   1.2  16.8  16.8  15.6  15.2  17.8  14.0  16.6  11.4  12.5  10.0
1978   0.6   0.6   8.9  14.0  17.6  18.1  17.5  15.2  13.9  12.3  11.2  12.9
1979   6.3  14.2   8.2  15.7  13.4  18.9  16.9  14.2  12.3   8.8  12.5   9.0
1980   6.6  -0.1  10.5  11.3  14.5  18.8  17.1  18.3  14.7  10.5   7.7   5.7
1981  -3.6   5.3   7.0  14.9  13.2  14.9  19.2  15.4  14.5  14.3   8.8   8.2
1982   9.3  11.9  14.8  18.0  16.5  13.3  16.7  17.8  14.8  15.2   9.1   6.0
1983   1.2  -2.3   3.4  16.2  15.5  13.6  17.1  17.8  16.8  14.1   5.0   7.1
1984   6.8   7.5   5.0  15.6  15.5  14.9  18.5  15.7  12.2  12.0   8.0  10.8
1985   0.0  14.2  17.0  17.6  15.6  15.6  17.4  18.1  15.9  15.7  12.5   1.8
1986   1.4   0.5   7.7  18.1  15.3  13.9  17.8  15.4  15.0  11.0  11.9   1.0
1987   3.2   5.5   8.3  12.3  16.5  14.0  15.9  16.6  15.4  12.4   9.7   9.5
1988   5.4   4.2  11.9  13.6  13.5  14.0  17.6  15.6  16.2  11.6   9.8   8.3
1989  12.0  15.0  13.5  16.0  17.4  16.4  18.9  15.9  13.4  14.6  14.0   5.3
1990   7.6  17.5  10.2  15.8  14.4  15.8  16.9  15.1  13.6  14.5  19.1  11.9
1991   7.7   2.7  14.7  14.0  14.5  16.2  16.6  14.9  11.7  13.6   8.4   7.8
1992  -1.1   7.0  10.3  13.9  15.9  13.8  17.3  15.8  15.0  11.7   9.8  13.1
1993  10.8   2.4   7.6   9.7  12.5  15.0  16.9  15.8  15.7  12.5  13.9   6.8
1994   8.3  10.4  12.4  14.0  13.6  16.9  17.2  17.5  13.8  12.7  16.7   5.4
1995   2.2   6.6  11.9  13.9  13.8  14.6  16.8  17.3  10.2  12.9  11.9  -0.3
1996   8.3   8.0  10.9   9.6  15.8  16.7  18.2  18.1  14.6  14.3  12.3   9.8
1997   2.0   4.2  15.0  11.4  12.9  14.8  16.0  16.0  12.5  13.3  10.0   8.4
1998   0.7   0.2   8.1  15.1  15.8  17.7  17.8  18.8  14.5  13.9   9.0  11.4
1999   8.0   6.9  12.0  17.1  15.7  14.0  19.1  14.4  14.3  14.5  11.3  10.5
2000  13.5   0.9   5.9  15.1  16.3  15.4  17.4  18.1  13.4  12.9   9.1   3.2
2001   2.0   9.5  11.6  16.1  15.5  16.5  17.4  16.4  13.7  13.9   6.8   6.7
2002   7.9  10.1  14.5  18.4  14.4  13.7  16.8  16.2  14.5  10.2   4.5   3.3
2003  -0.4   7.5  10.4  14.5  15.9  13.7  18.2  16.4  13.2  11.4  18.1   3.8
2004   5.1   1.8  14.0  11.6  15.2  16.5  15.0  13.9  15.9  12.5  11.1   9.2
2005   4.0   8.1   8.4  14.0  11.9  14.6  17.0  14.9  16.1  13.0  13.9  -0.5
2006   8.0  14.4  14.8  15.5  16.5  16.5  16.3  18.1  14.7  14.2  14.7   4.9
2007   8.5   8.2  12.7   9.9  15.5  16.3  14.7  16.1  13.9  13.3   7.6  10.6 
2008   9.3   5.8  13.2  18.2  14.1  17.0  16.6  14.8  14.0  15.4  10.8  14.7
2009   9.6  14.8  17.4  15.9  16.0  13.2  15.8  16.2  13.6  10.7  12.2   4.3
2010   0.0   5.0  -99.  -99.  -99.  -99.  -99.  -99.  -99.  -99.  -99.  -99.

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NDJFM North Pacific Index

Nov-Mar NP Values (-1000 mb)  1900-2008 (Missing Value = -999.)

         00     01     02     03     04     05     06     07     08     09

1900   5.62  10.00   9.48  13.51  13.11   8.48  10.29  14.14  11.82  10.60
1910  11.88  12.78   9.43   9.41   9.07  10.46  12.84  12.16  10.30   8.56
1920  11.98   9.82  11.01  10.86   8.44   8.33   5.14   7.96   8.52   7.67
1930  10.93   6.22  11.15  10.65   6.66   8.91   7.51  12.92   8.94   9.39
1940   3.68   5.35   8.10  12.33   7.80   6.08   9.33  10.67  11.34  10.92
1950  10.39  11.90  11.09   7.60   9.81  11.21  12.30  10.31   7.83  10.30
1960   9.26   6.87  10.68   7.47   9.08   9.89  11.27  10.96   9.02  10.83
1970   5.74  11.48  11.84   9.51   9.06  10.02  10.09   5.95   6.49  10.55
1980   7.69   4.44  10.60   3.46   6.28  10.01   4.79   5.97   8.13  11.74
1990  10.90  11.24   6.45   8.75  10.36   8.56   7.77   8.67   5.48   9.45
2000   8.45   7.08   9.20   5.06   8.56   8.15  10.11   9.83   9.30  13.47

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NDJFM North Pacific Anomalies

Mean for 1925-1989    1008.90

Anomalies (Missing Value = -999.)

         00     01     02     03     04     05     06     07     08     09

1900  -3.28   1.10   0.58   4.61   4.21  -0.42   1.39   5.24   2.92   1.70
1910   2.98   3.88   0.53   0.51   0.17   1.56   3.94   3.26   1.40  -0.34
1920   3.08   0.92   2.11   1.96  -0.46  -0.57  -3.76  -0.94  -0.38  -1.23
1930   2.03  -2.68   2.25   1.75  -2.24   0.01  -1.39   4.02   0.04   0.49
1940  -5.22  -3.55  -0.80   3.43  -1.10  -2.82   0.43   1.77   2.44   2.02
1950   1.49   3.00   2.19  -1.30   0.91   2.31   3.40   1.41  -1.07   1.40
1960   0.36  -2.03   1.78  -1.43   0.18   0.99   2.37   2.06   0.12   1.93
1970  -3.16   2.58   2.94   0.61   0.16   1.12   1.19  -2.95  -2.41   1.65
1980  -1.21  -4.46   1.70  -5.44  -2.62   1.11  -4.11  -2.93  -0.77   2.84
1990   2.00   2.34  -2.45  -0.15   1.46  -0.34  -1.13  -0.23  -3.42   0.55
2000  -0.45  -1.82   0.30  -3.84  -0.34  -0.75   1.21   0.93   0.40   4.57

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