Hurrell PC-Based North Atlantic Oscillation Index (DJF)
  1899   -0.55
  1900   -1.26
  1901   -0.29
  1902   -0.76
  1903    0.94
  1904   -0.07
  1905    0.76
  1906    0.84
  1907    0.80
  1908    0.48
  1909    0.15
  1910    0.22
  1911    0.45
  1912   -0.90
  1913    0.70
  1914    0.48
  1915   -0.22
  1916    0.39
  1917   -1.31
  1918   -0.04
  1919   -0.99
  1920    1.12
  1921    0.07
  1922    0.52
  1923    0.41
  1924   -0.06
  1925    1.36
  1926   -0.64
  1927    0.35
  1928    0.39
  1929   -0.93
  1930    0.55
  1931   -0.09
  1932    0.37
  1933   -0.07
  1934    0.93
  1935    0.12
  1936   -2.01
  1937    0.41
  1938    0.06
  1939   -0.26
  1940   -1.96
  1941   -1.17
  1942   -0.80
  1943    0.48
  1944    0.79
  1945   -0.40
  1946   -0.29
  1947   -1.82
  1948   -0.42
  1949    1.32
  1950    0.36
  1951   -0.48
  1952    0.65
  1953   -0.28
  1954    0.23
  1955   -1.00
  1956   -1.30
  1957    0.60
  1958   -0.51
  1959   -0.18
  1960   -1.64
  1961    0.46
  1962    0.05
  1963   -1.65
  1964   -0.71
  1965   -0.69
  1966   -1.96
  1967   -0.03
  1968   -0.61
  1969   -2.39
  1970   -1.11
  1971   -0.48
  1972   -0.07
  1973    1.14
  1974    0.48
  1975    1.02
  1976    1.14
  1977   -1.69
  1978   -1.10
  1979   -2.04
  1980   -0.20
  1981    0.99
  1982   -0.84
  1983    1.39
  1984    1.05
  1985   -1.01
  1986   -0.92
  1987   -0.52
  1988   -0.23
  1989    2.43
  1990    1.25
  1991    0.92
  1992    1.60
  1993    1.81
  1994    0.26
  1995    1.37
  1996   -1.39
  1997    0.20
  1998   -0.22
  1999    1.08
  2000    1.82
  2001   -0.66
  2002    0.53
  2003   -0.34
  2004   -0.38
  2005    1.04
  2006   -0.44
  2007    0.88
  2008    1.12
  2009   -0.10
  2010   -2.98
  2011   -1.18
  2012    1.49
  2013   -0.84
  2014    0.59
  2015    1.65
  2016    0.95
  2017    0.75
  2018    0.50
  2019    0.17
  2020    1.83
  2021   -1.35
  2022    1.18
  2023   -0.09
  2024    0.22
  2025    0.25