Hurrell PC-Based North Atlantic Oscillation Index (DJF)
  1899   -0.55
  1900   -1.24
  1901   -0.27
  1902   -0.74
  1903    0.94
  1904   -0.07
  1905    0.77
  1906    0.85
  1907    0.82
  1908    0.49
  1909    0.16
  1910    0.22
  1911    0.47
  1912   -0.90
  1913    0.69
  1914    0.49
  1915   -0.23
  1916    0.40
  1917   -1.30
  1918   -0.02
  1919   -0.98
  1920    1.12
  1921    0.08
  1922    0.52
  1923    0.41
  1924   -0.04
  1925    1.36
  1926   -0.65
  1927    0.37
  1928    0.39
  1929   -0.91
  1930    0.55
  1931   -0.08
  1932    0.39
  1933   -0.06
  1934    0.95
  1935    0.12
  1936   -2.00
  1937    0.41
  1938    0.08
  1939   -0.26
  1940   -1.94
  1941   -1.15
  1942   -0.77
  1943    0.48
  1944    0.81
  1945   -0.38
  1946   -0.28
  1947   -1.81
  1948   -0.41
  1949    1.33
  1950    0.36
  1951   -0.47
  1952    0.67
  1953   -0.26
  1954    0.25
  1955   -0.99
  1956   -1.28
  1957    0.60
  1958   -0.49
  1959   -0.17
  1960   -1.63
  1961    0.47
  1962    0.07
  1963   -1.62
  1964   -0.69
  1965   -0.65
  1966   -1.96
  1967   -0.02
  1968   -0.58
  1969   -2.36
  1970   -1.10
  1971   -0.46
  1972   -0.06
  1973    1.15
  1974    0.48
  1975    1.03
  1976    1.17
  1977   -1.68
  1978   -1.09
  1979   -2.03
  1980   -0.19
  1981    1.01
  1982   -0.83
  1983    1.41
  1984    1.06
  1985   -0.99
  1986   -0.91
  1987   -0.50
  1988   -0.22
  1989    2.43
  1990    1.24
  1991    0.93
  1992    1.63
  1993    1.82
  1994    0.26
  1995    1.36
  1996   -1.37
  1997    0.21
  1998   -0.21
  1999    1.09
  2000    1.83
  2001   -0.66
  2002    0.54
  2003   -0.33
  2004   -0.36
  2005    1.07
  2006   -0.42
  2007    0.88
  2008    1.13
  2009   -0.10
  2010   -2.96
  2011   -1.16
  2012    1.50
  2013   -0.83
  2014    0.57
  2015    1.65
  2016    0.94
  2017    0.76
  2018    0.51
  2019    0.18
  2020    1.82
  2021   -1.34
  2022    1.19
  2023   -0.07
  2024    0.23
  2025    0.26
  2026   -1.32