Hurrell PC-Based North Atlantic Oscillation Index (DJFM)
  1899   -0.71
  1900   -1.35
  1901   -0.37
  1902   -0.70
  1903    1.33
  1904   -0.02
  1905    0.82
  1906    0.82
  1907    1.08
  1908    0.54
  1909   -0.52
  1910    0.42
  1911    0.46
  1912   -0.44
  1913    1.40
  1914    0.47
  1915   -0.71
  1916   -0.23
  1917   -1.19
  1918    0.01
  1919   -0.89
  1920    1.57
  1921    0.68
  1922    0.58
  1923    0.35
  1924   -0.66
  1925    1.07
  1926   -0.31
  1927    0.48
  1928    0.15
  1929   -0.61
  1930    0.41
  1931   -0.70
  1932   -0.10
  1933   -0.11
  1934    0.95
  1935    0.06
  1936   -1.96
  1937   -0.16
  1938    0.53
  1939   -0.14
  1940   -1.95
  1941   -1.24
  1942   -1.10
  1943    0.61
  1944    0.52
  1945   -0.10
  1946   -0.28
  1947   -1.88
  1948    0.26
  1949    1.01
  1950    0.47
  1951   -0.95
  1952   -0.15
  1953   -0.03
  1954    0.13
  1955   -1.26
  1956   -1.06
  1957    0.04
  1958   -1.27
  1959    0.09
  1960   -1.83
  1961    0.73
  1962   -0.93
  1963   -1.31
  1964   -0.88
  1965   -0.82
  1966   -1.58
  1967    0.61
  1968   -0.16
  1969   -2.60
  1970   -1.17
  1971   -0.68
  1972    0.10
  1973    1.19
  1974    0.36
  1975    0.74
  1976    1.22
  1977   -1.36
  1978   -0.56
  1979   -1.46
  1980   -0.37
  1981    0.28
  1982   -0.22
  1983    1.28
  1984    0.40
  1985   -0.83
  1986   -0.03
  1987   -0.68
  1988   -0.18
  1989    2.47
  1990    1.93
  1991    0.55
  1992    1.76
  1993    1.76
  1994    0.86
  1995    1.30
  1996   -1.47
  1997    0.71
  1998   -0.02
  1999    0.65
  2000    1.61
  2001   -1.02
  2002    0.62
  2003    0.04
  2004   -0.13
  2005    0.35
  2006   -0.92
  2007    1.17
  2008    1.06
  2009    0.03
  2010   -2.58
  2011   -0.69
  2012    1.59
  2013   -1.70
  2014    0.91
  2015    1.86
  2016    1.00
  2017    0.89
  2018   -0.18
  2019    0.76
  2020    1.80
  2021   -0.73
  2022    1.10
  2023   -0.59
  2024   -0.12
  2025    0.38
  2026   -0.45