Hurrell PC-Based North Atlantic Oscillation Index (DJF) 1899 -0.54 1900 -1.24 1901 -0.28 1902 -0.75 1903 0.93 1904 -0.06 1905 0.75 1906 0.84 1907 0.80 1908 0.49 1909 0.15 1910 0.23 1911 0.45 1912 -0.88 1913 0.70 1914 0.49 1915 -0.21 1916 0.40 1917 -1.30 1918 -0.04 1919 -0.98 1920 1.12 1921 0.07 1922 0.53 1923 0.42 1924 -0.05 1925 1.36 1926 -0.63 1927 0.35 1928 0.39 1929 -0.92 1930 0.55 1931 -0.08 1932 0.37 1933 -0.07 1934 0.92 1935 0.12 1936 -1.99 1937 0.41 1938 0.06 1939 -0.25 1940 -1.94 1941 -1.16 1942 -0.79 1943 0.48 1944 0.78 1945 -0.39 1946 -0.28 1947 -1.80 1948 -0.41 1949 1.31 1950 0.36 1951 -0.47 1952 0.65 1953 -0.28 1954 0.23 1955 -0.99 1956 -1.29 1957 0.60 1958 -0.50 1959 -0.18 1960 -1.63 1961 0.47 1962 0.06 1963 -1.63 1964 -0.71 1965 -0.68 1966 -1.94 1967 -0.02 1968 -0.60 1969 -2.37 1970 -1.10 1971 -0.47 1972 -0.06 1973 1.13 1974 0.49 1975 1.02 1976 1.14 1977 -1.67 1978 -1.09 1979 -2.02 1980 -0.19 1981 0.99 1982 -0.83 1983 1.38 1984 1.04 1985 -1.00 1986 -0.91 1987 -0.51 1988 -0.22 1989 2.41 1990 1.25 1991 0.92 1992 1.59 1993 1.80 1994 0.26 1995 1.36 1996 -1.38 1997 0.20 1998 -0.22 1999 1.08 2000 1.81 2001 -0.65 2002 0.53 2003 -0.33 2004 -0.37 2005 1.03 2006 -0.44 2007 0.87 2008 1.11 2009 -0.10 2010 -2.95 2011 -1.17 2012 1.48 2013 -0.83 2014 0.59 2015 1.64 2016 0.94 2017 0.74 2018 0.50 2019 0.17 2020 1.82 2021 -1.34 2022 1.18 2023 -0.09