1901-2000 Degrees Fahrenheit 1 35.6 29.6 6.0 115 15 1918 2023 1994 1990 top-third 1947,2012 2 37.3 31.3 6.0 120 9 1918 1932,2016 1994 1950 top-tenth 2013 3 41.0 35.2 5.8 122 7 1918 2016 1994 1932 top-tenth 4 44.0 40.0 4.0 119 10 1918 1932 1994 1991 top-tenth 2017 5 48.0 45.0 3.0 112 17 1918 1932 1994 1991 top-third 2013 6 51.7 49.4 2.3 109 20 1918 2016 1994 1991 top-third 1947,1960,2000 7 55.3 52.9 2.4 111 18 1918 2016 1994 1991 top-third 1974,1991 8 57.4 54.8 2.6 113 16 1918 2016 1994 1950 top-third 2000 9 57.5 55.4 2.1 109 20 1918 2016 1994 1992 top-third 10 57.1 54.8 2.3 110 19 1918 2016 1994 1992 top-third 2000 11 55.4 53.3 2.1 108 21 1918 2012 1994 1992 top-third 12 53.2 51.4 1.8 104 25 1918 2013 1994 1992 top-third 18 51.7 50.8 0.9 89 39 1905 2017 1994 1992 top-third 1947,1958,1984,1987 24 52.2 51.4 0.8 87 41 1918 2013 1994 1993 top-third 1956,1974,1984,1985,1989,1998 36 52.0 51.4 0.6 76 51 1918 2013 1984 1994 normal 1947,1958,1960 48 52.6 51.4 1.2 97 29 1918 2023 1991 1994 top-third 60 52.9 51.4 1.5 100 25 1908 2023 1994 1992 top-third 1992