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.
J F M A M J J A S O N D 1865 -0.5 -1.6 0.0 0.0 0.1 0.1 0.0 1.3 3.1 -3.2 -0.9 1.5 1866 0.8 0.9 -0.9 -2.6 -2.3 1.6 -1.1 0.0 3.6 -0.2 -0.5 0.6 1867 -4.7 1.4 -5.1 2.1 -5.4 -0.2 -3.6 3.0 2.0 2.8 -4.7 -0.2 1868 0.9 3.8 4.4 2.1 3.6 4.5 1.8 1.8 -4.4 4.6 -2.7 0.6 1869 2.0 3.1 -0.3 -0.2 -3.6 -2.4 -0.1 -1.9 -0.5 -2.4 1.4 -0.3 1870 0.4 -3.3 -2.5 1.6 2.1 0.3 1.3 -4.9 0.6 1.2 -3.0 -4.5 1871 2.3 -0.4 1.2 -3.1 -1.7 -1.9 1.8 0.7 -3.5 0.4 -4.6 1.1 1872 1.5 -0.7 -1.2 -0.7 0.9 0.5 -3.4 -3.5 -2.8 1.7 0.6 -0.9 1873 2.1 -1.2 1.6 -3.8 -1.5 2.7 0.2 4.0 -3.2 2.1 -2.8 1.0 1874 2.2 1.2 1.0 2.7 -1.7 -0.4 1.7 1.4 2.2 2.8 -0.2 -1.0 1875 -0.8 -1.5 -1.0 -2.0 4.1 4.5 -2.4 -1.6 -1.8 0.1 -4.6 -0.3 1876 1.2 -0.8 0.5 -1.2 0.7 4.7 4.2 0.6 -5.6 -2.2 -5.3 -2.3 1877 1.5 1.3 0.0 -3.7 -3.5 0.2 1.9 -7.0 -4.7 0.4 3.2 3.3 1878 0.0 -0.3 -0.1 -2.8 -0.3 -1.4 0.7 -4.2 1.9 -1.8 -4.8 -7.5 1879 -1.5 1.0 1.4 -0.3 2.1 -1.2 -1.1 -0.6 4.9 -0.9 -5.2 -1.1 1880 -1.1 1.6 0.4 1.7 -0.7 -0.4 -5.1 -0.1 -1.3 -7.1 1.2 -3.3 1881 -7.7 -1.5 -2.4 -2.2 1.0 1.6 2.8 -1.1 -2.7 -1.7 2.8 3.8 1882 1.4 0.7 4.3 -1.8 -1.5 -0.6 3.4 0.7 2.1 0.6 1.8 -2.3 1883 1.4 3.4 -3.2 1.8 1.4 -2.7 -3.7 1.8 -1.0 3.5 2.8 0.9 1884 1.0 1.3 1.7 -2.1 0.5 1.4 -4.1 2.1 2.3 1.6 -1.7 3.0 1885 -0.3 -2.1 0.8 1.4 -2.1 2.4 0.5 -6.6 2.9 -1.0 -1.2 -1.7 1886 0.0 -0.4 -1.0 -1.2 -1.9 1.5 1.1 4.6 -1.5 0.9 2.1 -0.4 1887 2.7 1.4 -2.1 -3.7 0.6 -2.3 -0.1 -3.0 -1.6 -4.3 -1.9 -3.5 1888 -2.4 -2.3 -1.9 -1.4 -1.9 -2.2 -3.1 -0.9 -3.4 -4.3 3.1 2.4 1889 1.3 -0.4 -0.4 1.8 1.4 2.7 -5.0 2.2 -2.3 1.0 2.1 4.0 1890 3.5 -1.0 2.5 2.1 -0.6 1.9 1.7 1.5 2.3 -0.4 3.6 -1.3 1891 -0.1 1.4 -1.5 -2.0 -1.3 -5.3 -3.0 0.0 2.8 2.4 0.0 2.4 1892 0.4 -2.6 -1.7 -0.8 -3.1 -2.3 -0.4 -0.5 3.8 -4.5 0.9 -1.9 1893 -3.1 1.2 -0.2 0.0 -1.0 -2.7 -0.2 -3.4 1.8 0.3 -3.4 3.3 1894 0.9 4.3 2.4 2.2 -1.5 4.1 1.4 0.2 -6.2 -3.9 3.6 0.7 1895 -2.7 -5.9 1.1 -0.7 1.0 -0.7 0.7 -0.7 1.0 -3.6 -0.1 -0.4 1896 -1.5 1.4 3.1 2.9 1.3 -0.7 3.7 -0.9 -0.1 -4.1 -0.9 2.7 1897 -2.4 1.4 1.2 4.6 0.5 -3.9 -0.6 2.0 0.7 -2.6 -0.9 0.9 1898 1.8 1.6 -0.7 3.0 -1.2 -1.3 -1.8 2.1 -0.1 -0.8 1.5 1.3 1899 -1.5 -1.5 -2.5 -0.6 -2.0 1.7 3.2 -3.4 1.8 -1.9 1.1 -1.2 1900 2.3 -4.0 -3.0 1.0 0.7 -1.0 -1.4 0.4 3.6 -0.8 2.7 2.1 1901 0.2 -3.9 -0.7 1.7 -1.8 2.3 2.1 1.2 2.5 2.1 -3.5 -0.2 1902 -0.6 -3.3 0.8 -2.1 0.4 -5.5 -4.3 -2.1 -3.1 0.7 0.5 0.9 1903 0.6 2.7 4.7 -0.2 1.6 -4.8 -1.0 0.9 -1.2 -1.5 1.0 0.5 1904 2.6 1.1 0.8 4.9 1.5 -0.8 -1.6 -2.9 1.4 0.8 -0.8 -1.7 1905 0.6 1.3 2.3 -2.3 1.6 -0.7 1.6 0.2 1.8 -3.2 0.9 0.4 1906 2.8 2.1 -0.5 2.9 -3.8 -2.1 4.6 -2.5 1.4 2.4 -0.1 1.4 1907 0.7 1.9 3.8 2.0 -3.5 0.9 -4.5 -0.8 0.1 -0.2 2.5 1.1 1908 1.1 2.1 2.6 -1.8 1.8 1.4 -1.2 -0.5 0.8 -0.4 0.4 2.4 1909 1.9 -0.2 -2.4 0.6 -2.6 -2.2 4.6 3.7 -2.7 2.7 -2.2 -2.8 1910 2.6 4.4 2.1 -1.3 3.1 0.3 -1.5 -2.3 -2.1 -1.3 -3.2 -0.4 1911 0.9 1.0 -0.1 -0.9 4.7 -0.5 -2.8 -1.3 0.1 -1.7 0.8 2.1 1912 -1.5 -2.4 2.3 1.0 1.2 -0.4 -1.5 -2.3 -4.1 2.1 0.9 3.0 1913 1.1 0.5 4.0 3.5 1.6 1.8 -2.0 1.0 -2.9 -2.2 5.2 0.2 1914 -0.5 2.1 1.4 1.8 3.4 2.7 -1.3 0.9 -0.6 -0.5 0.2 2.3 1915 0.9 1.1 -3.8 3.8 -3.4 -3.5 -0.2 -3.5 -3.8 1.6 -4.0 -3.7 1916 2.8 2.3 -3.9 1.2 -0.6 -2.7 0.6 -1.9 -2.1 3.2 -0.3 -4.7 1917 -3.5 -1.6 -0.7 -3.2 -3.3 0.2 -3.5 -0.9 2.7 1.8 1.8 -3.3 1918 -5.7 3.1 0.9 -0.7 0.7 2.1 -4.5 1.3 0.6 2.5 0.7 0.5 1919 -0.1 -3.2 -1.0 1.1 -0.4 4.1 -3.3 1.6 1.1 -1.7 -2.5 2.9 1920 3.0 1.2 4.4 -2.1 3.2 -0.5 4.7 -1.3 2.1 0.1 3.3 -2.1 1921 2.0 0.3 3.9 -0.4 3.3 -1.5 -1.5 0.8 -0.3 -1.1 -1.0 3.5 1922 0.9 3.7 0.3 -0.5 1.8 4.0 2.6 2.1 1.3 -5.0 -0.6 1.0 1923 1.7 1.4 0.1 0.5 -1.1 0.8 4.1 0.3 2.4 2.4 -0.2 1.0 1924 0.8 -1.1 -3.9 -2.8 -0.5 -0.8 3.2 2.4 2.0 1.2 0.6 4.6 1925 1.6 2.3 -1.5 2.5 2.7 1.4 3.8 1.6 -0.3 -2.1 -2.4 -5.3 1926 0.8 0.8 0.2 1.2 -1.8 -2.1 2.1 1.2 -0.8 -4.4 2.7 -1.5 1927 2.3 0.3 2.3 1.1 -2.9 -0.6 0.1 0.3 -0.6 -4.2 0.6 -4.6 1928 3.9 2.3 -1.3 1.4 -4.0 -3.5 2.0 -1.9 -1.1 2.2 2.1 0.5 1929 -5.7 -0.2 -1.6 -3.7 2.6 -0.8 -0.8 0.2 2.3 2.3 2.8 4.1 1930 2.2 -0.5 -1.4 -0.4 3.2 4.2 -0.1 0.2 -4.7 1.0 1.3 2.8 1931 -0.5 2.0 -3.8 1.5 -1.1 -2.5 2.9 -2.6 -2.8 -0.9 4.2 -0.2 1932 1.7 -4.8 -1.6 0.3 -2.3 -1.9 2.3 2.3 0.4 1.8 0.9 0.8 1933 2.6 -3.0 0.9 -2.4 0.2 2.7 3.0 2.8 -0.7 -2.8 -0.1 -1.3 1934 2.3 0.4 2.5 -2.4 3.9 -2.7 0.6 3.3 3.6 1.2 -0.5 -1.0 1935 -0.6 2.9 0.1 -2.5 -2.9 1.3 6.1 2.5 0.2 4.5 2.5 -2.6 1936 -3.9 -3.2 -1.0 -1.3 0.9 0.7 1.2 2.6 -3.3 2.9 2.2 1.8 1937 1.6 0.4 -2.7 1.5 2.6 -0.2 1.0 2.2 2.7 -0.8 -3.7 -1.8 1938 3.0 -1.1 3.1 -2.1 0.9 1.9 3.1 1.2 2.0 5.5 3.4 1.2 1939 -2.9 3.0 0.7 -0.4 0.5 -0.7 -1.6 1.9 -5.9 -1.4 1.8 -2.4 1940 -3.6 -2.5 -1.7 -0.7 0.4 2.4 -0.5 0.9 0.0 -0.3 1.8 -0.4 1941 -4.3 -1.1 -1.4 -2.2 0.0 0.4 2.9 -0.2 -1.5 -2.1 0.4 1.0 1942 1.9 -3.6 -2.0 -0.3 0.1 -2.6 2.0 2.4 3.3 1.3 -2.0 0.9 1943 -0.6 3.1 1.1 4.3 0.7 0.6 0.6 -2.7 3.3 1.6 1.3 1.3 1944 1.6 -0.6 -2.0 -0.3 0.9 -0.5 -4.3 2.3 1.3 2.4 0.7 1.4 1945 -3.7 3.4 0.9 -2.2 0.1 0.7 0.0 1.6 1.1 -2.6 -3.3 -2.5 1946 2.0 -0.5 0.1 3.5 -3.3 3.4 3.6 2.4 1.8 -3.3 -1.4 2.0 1947 0.2 -5.6 -3.3 4.0 0.0 0.3 1.6 -0.2 3.3 -0.5 -2.9 -3.1 1948 1.2 -0.5 2.6 1.8 -0.6 -1.0 -0.9 -0.4 -0.1 1.9 -1.7 -0.4 1949 1.1 2.7 -0.4 3.1 -0.6 -2.5 -1.9 -1.1 -1.4 0.2 2.2 0.7 1950 0.2 1.9 0.1 2.0 -3.0 0.3 0.5 2.4 4.4 1.6 -0.6 -2.0 1951 1.2 1.7 -2.6 -2.0 -2.6 -3.5 0.0 2.8 0.5 2.1 -0.2 3.8 1952 2.2 -1.6 -2.3 2.8 -2.7 -0.3 0.6 -0.9 -3.7 0.1 -2.8 -1.7 1953 -1.4 0.6 0.5 -3.2 -1.5 1.6 2.6 2.9 2.1 2.6 3.6 1.7 1954 0.0 1.9 0.9 0.8 -2.2 1.1 4.2 -0.2 2.5 1.8 3.5 2.2 1955 -2.5 -2.9 -3.2 1.1 -0.2 -0.3 2.3 2.2 5.4 -2.1 -4.0 -1.1 1956 -1.2 -2.9 0.8 -2.0 6.3 0.5 -1.6 -2.2 -1.2 1.3 2.4 2.3 1957 2.6 -1.3 -1.7 1.0 -0.2 -4.3 -3.4 0.8 -3.5 4.2 -2.6 1.4 1958 -0.6 -3.0 -3.1 1.6 -1.4 -3.0 -3.7 -0.9 -1.5 2.2 2.2 -1.4 1959 -4.4 2.0 2.4 1.0 -0.7 1.7 2.6 0.1 0.3 2.4 1.4 2.8 1960 -2.8 -3.9 -0.9 1.9 0.3 0.5 2.3 -5.1 1.8 -4.2 0.7 2.6 1961 1.0 1.5 0.5 -1.3 -1.1 4.9 0.0 2.3 4.1 2.5 -0.1 -5.8 1962 2.9 0.6 -5.3 0.4 -0.7 -0.1 -4.1 1.1 -0.5 0.2 -0.8 -1.7 1963 -7.0 -1.7 1.3 -0.9 6.9 -2.2 -2.8 0.0 3.1 3.7 -1.4 -3.6 1964 -1.9 -1.8 -1.2 1.2 2.6 0.0 3.6 -4.2 -1.4 1.5 0.6 -0.2 1965 -0.3 -5.1 -1.6 3.4 -1.3 1.8 -2.2 1.2 -0.4 -0.4 -3.5 0.7 1966 -4.5 -2.9 0.4 -1.0 3.0 1.5 0.5 -4.1 -1.7 -4.6 0.5 2.3 1967 -2.5 2.0 2.8 0.8 -0.7 2.9 -0.2 0.4 0.5 2.9 1.2 -1.8 1968 0.2 -2.1 2.0 -2.2 -1.9 0.8 -6.6 -1.6 -1.6 -4.2 -1.9 -2.3 1969 -4.3 -4.0 -3.0 1.6 -2.0 0.5 2.7 -0.6 2.3 1.4 -0.9 1.1 1970 -3.0 0.9 -1.8 0.9 3.1 0.6 -0.1 -0.5 0.5 -1.1 -0.2 -2.7 1971 -1.4 1.2 0.0 -2.0 3.4 -3.3 -3.0 2.9 -2.3 -0.3 0.7 1.0 1972 0.7 0.7 1.6 1.3 3.2 4.3 -0.2 0.2 -4.4 -1.6 1.5 2.7 1973 0.7 2.6 1.2 -4.1 -1.1 2.7 0.4 1.1 -0.6 -1.9 -2.1 -0.6 1974 3.7 1.4 0.4 -0.6 -0.1 -0.7 1.6 -0.2 1.3 -0.9 1.1 2.4 1975 1.9 -0.6 -0.5 -0.2 -1.9 -1.4 0.2 -0.5 2.8 -1.4 1.5 -1.1 1976 0.7 1.8 3.0 0.3 3.8 1.4 -3.6 -2.4 -6.9 2.5 1.4 -3.9 1977 -2.7 -1.3 -0.5 0.6 -1.2 -2.1 -0.1 -1.1 -1.1 1.4 -0.7 -1.8 1978 1.7 -3.7 3.6 -2.5 2.1 1.4 -3.6 -2.5 0.3 0.1 3.9 -3.9 1979 -3.6 -1.1 1.4 -2.1 -0.5 1.1 0.8 0.0 0.8 0.6 2.1 2.1 1980 -2.6 0.6 0.0 0.0 -2.9 1.1 -2.8 -2.5 2.2 -2.0 -3.8 1.6 1981 0.5 1.5 -0.9 -1.9 0.5 -2.2 2.1 0.7 0.1 -0.2 -1.0 -2.3 1982 -1.9 2.6 3.1 -0.6 1.2 -4.0 -1.0 3.2 1.7 1.8 3.2 3.3 1983 3.5 -1.8 2.4 -1.4 -0.5 0.9 -0.1 1.5 -2.6 2.8 -4.3 0.4 1984 4.1 1.9 -2.4 -0.7 2.0 0.0 -2.2 0.6 0.5 2.0 0.9 2.1 1985 -3.9 -1.8 0.5 0.3 -1.0 -2.2 0.9 1.9 -2.3 -0.4 -3.3 -1.9 1986 2.7 -3.9 5.0 0.0 3.7 0.8 1.0 -4.9 -4.8 5.4 4.7 2.7 1987 -4.6 -0.8 0.0 1.1 -2.5 -2.0 0.0 -4.3 0.8 1.2 -0.1 -2.7 1988 1.3 0.1 0.9 -2.9 -0.1 0.2 2.0 2.9 0.9 -2.2 -2.6 0.6 1989 3.2 4.1 4.2 0.8 1.1 -1.1 -0.9 4.3 0.6 1.6 -1.9 -3.8 1990 4.3 4.7 2.9 3.8 -2.8 1.3 0.4 1.6 -0.6 1.0 -1.7 1.5 1991 1.0 0.5 -0.1 1.3 0.4 -1.2 -1.5 3.1 -0.5 -0.8 2.4 0.2 1992 -1.4 2.7 2.4 2.1 0.9 -0.4 0.5 3.8 -0.2 -2.3 3.8 1.7 1993 3.2 -0.1 1.7 1.8 -4.3 -0.4 -0.8 -0.2 -5.1 -0.5 3.7 3.0 1994 2.3 -0.4 5.5 1.3 -0.5 3.4 2.3 -1.3 -0.7 -1.5 0.8 2.4 1995 1.9 3.1 2.2 -2.6 -0.9 -2.9 -0.9 -0.8 -0.1 0.3 -4.5 -5.2 1996 -2.0 0.8 -3.2 -0.9 -2.3 0.9 1.9 0.9 -0.6 2.6 0.4 -5.1 1997 -3.1 4.8 1.6 -2.1 -2.5 -3.9 1.4 1.5 -0.8 -3.3 0.6 -0.3 1998 -1.0 1.1 0.4 0.6 -0.5 -1.7 0.7 3.0 -3.1 1.5 1.6 2.7 1999 1.8 2.5 0.3 -0.3 1.4 1.9 -1.3 -3.2 2.8 0.5 1.0 2.3 2000 -0.2 3.9 0.4 -3.1 2.3 -0.7 -3.8 0.3 0.8 6.9 -0.4 -3.3
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.
DJF JFM FMA MAM AMJ MJJ JJA JAS ASO SON OND NDJ 1865 -1.7 -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 0.0 -0.5 0.6 -0.1 0.6 0.8 2.2 2.3 1999 2.8 2.0 1.6 0.5 1.0 0.6 -1.0 -1.1 -0.1 1.4 1.7 1.5 2000 2.7 2.0 1.3 -0.4 -1.1 -0.5 -1.3 -0.8 3.3 2.6 0.4 -2.3
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.
00 01 02 03 04 05 06 07 08 09 1860 -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 1.35 2.43 2000 1.10
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