1901-2000 Degrees Fahrenheit 1 57.0 53.7 3.3 109 20 1907 1934 1991 1988 top-third 2 48.6 47.5 1.1 84 45 1907 1977 1990 1991 normal 1913 3 43.5 39.9 3.6 113 16 1899 1977 1990 1991 top-third 4 38.7 32.9 5.8 123 6 1899 1977 1990 1991 top-tenth 5 35.0 27.6 7.4 126 3 1950 1987 1991 1987 top-tenth 2016 6 32.6 25.1 7.5 124 4 1950 2012 1991 1987 top-tenth 7 31.0 25.3 5.7 121 7 1979 2012 1991 1987 top-tenth 8 32.1 27.7 4.4 120 8 1899 2012 1991 1987 top-tenth 9 34.8 30.8 4.0 120 8 1899 2012 1991 1987 top-tenth 10 38.4 34.4 4.0 121 7 1899 2012 1991 1987 top-tenth 11 41.2 37.6 3.6 120 8 1899 2012 1991 1987 top-tenth 1999 12 43.3 39.7 3.6 121 7 1899 2012 1991 1987 top-tenth 18 38.4 34.8 3.6 119 8 1951 1988 1991 1988 top-tenth 24 42.8 39.7 3.1 120 7 1917 2017 1991 1988 top-tenth 36 42.6 39.7 2.9 122 4 1899 2000 1991 1992 top-tenth 48 42.1 39.6 2.5 121 4 1899 2001 1991 1990 top-tenth 2007 60 42.2 39.6 2.6 121 3 1920 1991,2002 1990 1991 top-tenth