1901-2000 Degrees Fahrenheit 1 37.1 39.1 -2.0 43 87 1960 2012 1980 1981 bottom-third 2 30.8 33.6 -2.8 29 101 1899 2012 1980 1981 bottom-third 3 25.4 30.3 -4.9 11 119 1912 2012 1979 1981 bottom-tenth 4 25.6 29.9 -4.3 8 121 1978 2012 1979 1981 bottom-tenth 5 29.2 31.9 -2.7 16 113 1912 2012 1979 1981 bottom-third 1962,1963 6 33.1 35.7 -2.6 14 115 1912,1978 2012 1979 1981 bottom-third 7 37.6 40.0 -2.4 12 117 1978 2017 1979 1981 bottom-tenth 8 41.9 44.2 -2.3 10 119 1978 2017 1979 1981 bottom-tenth 1905 9 45.5 47.8 -2.3 13 116 1978 2012 1979 1981 bottom-tenth 10 48.2 50.2 -2.0 14 115 1904 1932,2012,2017 1979 1981 bottom-third 2015 11 49.1 51.2 -2.1 10 119 1918,1977 2012,2017 1979 1981 bottom-tenth 12 49.8 51.3 -1.5 17 112 1918 2017 1979 1981 bottom-third 1994,2010 18 45.4 46.1 -0.7 34 94 1979 2017 1980 1981 bottom-third 1916,1977 24 51.0 51.2 -0.2 43 85 1905 2017 1980 1981 normal 1944,1961,1975,1995 36 50.9 51.2 -0.3 42 85 1979 2018 1981 1976 bottom-third 1910,1984,2011 48 50.4 51.2 -0.8 13 113 1980 1935 1981 1977 bottom-tenth 1908,1919,1920,1963 60 50.2 51.2 -1.0 7 118 1906 1935 1981 1978 bottom-tenth 1907,1971,1997