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.
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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.
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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.
Return to Climate Indices Table
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
Return to Climate Indices Table
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