Hurrell PC-Based North Atlantic Oscillation Index (JJA)
  1899     0.20
  1900    -0.67
  1901     1.04
  1902    -2.19
  1903    -2.14
  1904    -1.08
  1905    -0.06
  1906    -0.70
  1907    -1.95
  1908    -0.05
  1909    -0.18
  1910    -1.72
  1911    -0.53
  1912    -1.45
  1913     0.73
  1914     0.35
  1915    -1.57
  1916    -0.39
  1917    -0.49
  1918    -0.58
  1919     1.00
  1920     0.89
  1921     0.20
  1922     0.58
  1923    -0.20
  1924    -0.10
  1925     0.57
  1926    -0.33
  1927    -0.38
  1928    -1.01
  1929    -0.60
  1930    -0.53
  1931    -0.94
  1932    -0.03
  1933     1.01
  1934    -0.41
  1935     0.69
  1936     0.44
  1937     1.31
  1938     1.08
  1939    -0.02
  1940     0.63
  1941     0.71
  1942     0.28
  1943    -1.38
  1944    -0.15
  1945    -0.43
  1946     0.91
  1947     1.06
  1948    -0.72
  1949     0.15
  1950    -0.34
  1951    -0.19
  1952     0.37
  1953     0.72
  1954    -0.30
  1955     1.82
  1956    -0.82
  1957    -0.69
  1958    -2.35
  1959     0.44
  1960    -0.84
  1961     1.42
  1962    -0.59
  1963    -0.74
  1964     0.60
  1965     0.00
  1966     0.11
  1967     1.66
  1968    -0.06
  1969     0.40
  1970     1.15
  1971     0.05
  1972     1.30
  1973     1.07
  1974    -0.17
  1975     0.93
  1976     1.48
  1977    -0.64
  1978     0.16
  1979     1.07
  1980    -0.94
  1981     0.88
  1982    -0.15
  1983     2.12
  1984     1.07
  1985    -0.48
  1986     0.39
  1987    -1.07
  1988     0.69
  1989     1.58
  1990     0.67
  1991     0.71
  1992     0.26
  1993    -1.15
  1994     2.05
  1995     0.74
  1996     1.28
  1997     0.06
  1998    -0.67
  1999     0.96
  2000    -0.05
  2001    -0.04
  2002     0.80
  2003    -0.31
  2004    -0.31
  2005     0.57
  2006     1.10
  2007    -1.12
  2008    -1.32
  2009    -2.06
  2010    -0.43
  2011    -2.09
  2012    -1.58
  2013     1.69
  2014    -0.86
  2015    -1.63
  2016    -0.69
  2017     0.36
  2018     1.89
  2019    -2.10
  2020    -0.29
  2021     1.11
  2022     0.45