1901-2000 Degrees Fahrenheit 1 61.4 62.9 -1.5 34 95 1915 1988 1985 1991 bottom-third 1901,1925,1927,1929,1967 2 59.2 58.3 0.9 82 47 1945 1988 1990 1991 normal 3 52.8 52.6 0.2 62 67 1907 1988 1983 1991 normal 1914,1923,1938,1959,1973 4 48.0 45.7 2.3 103 26 1899 1977 1990 1991 top-third 2005 5 43.2 38.9 4.3 121 8 1899 1987 1990 1991 top-tenth 6 39.4 33.5 5.9 123 6 1950 1987 1991 1987 top-tenth 7 36.7 30.5 6.2 124 4 1950 1987 1991 1987 top-tenth 8 34.8 30.0 4.8 118 10 1979 2012 1991 1988 top-tenth 9 35.3 31.6 3.7 117 11 1899 2012 1991 1988 top-tenth 10 37.5 34.0 3.5 116 12 1899 2012 1991 1988 top-tenth 1999 11 40.5 37.0 3.5 119 9 1899 2012 1991 1988 top-tenth 1999 12 42.9 39.7 3.2 119 9 1899 2012 1991 1988 top-tenth 1999,2021 18 41.4 37.6 3.8 122 6 1951 1988 1991 1988 top-tenth 24 42.7 39.7 3.0 119 8 1917 2017 1991 1988 top-tenth 36 42.6 39.7 2.9 122 4 1899 2000,2017 1991 1992 top-tenth 2007 48 41.9 39.6 2.3 117 8 1899 2018 1991 1991 top-tenth 1991 60 42.1 39.6 2.5 121 3 1920 1991,2002 1990 1991 top-tenth 2016