1901-2000 Degrees Fahrenheit 1 35.2 32.8 2.4 90 40 1917 2017 1980 1978 top-third 2000 2 32.7 29.2 3.5 115 15 1903 2015 1980 1972 top-third 2004 3 31.8 26.5 5.3 123 7 1917 2015 1980 1934 top-tenth 4 32.1 25.6 6.5 126 3 1917 2015 1980 1934 top-tenth 5 32.4 26.9 5.5 125 4 1917 1934 1980 1934 top-tenth 6 34.5 30.0 4.5 124 5 1917 1934 1980 1934 top-tenth 2000 7 37.8 33.8 4.0 124 5 1917 1934,2015 1980 1934 top-tenth 8 41.1 37.6 3.5 124 5 1917 1934 1980 1934 top-tenth 1999 9 44.1 40.9 3.2 123 6 1917 2015 1980 1934 top-tenth 10 45.8 42.8 3.0 123 6 1917 1934 1980 1934 top-tenth 11 46.2 43.6 2.6 122 7 1917 2015 1980 1934 top-tenth 1999,2004,2021 12 45.7 43.4 2.3 117 12 1913 2015 1980 1978 top-tenth 1935,1999 18 40.6 38.9 1.7 105 23 1913 2018 1980 1978 top-third 1990,2008 24 44.8 43.4 1.4 100 28 1913 2018 1980 1978 top-third 1978,1991,1995,1997 36 43.9 43.4 0.5 79 48 1914 2017,2018 1980 1980 normal 1956,1959,1963,1978,1980,1987 48 44.4 43.4 1.0 89 37 1915 2018 1980 1941 top-third 1941 60 44.2 43.4 0.8 88 37 1917 2018,2019 1980 1938 top-third