1901-2000 Degrees Fahrenheit 1 8.2 19.9 -11.7 5 125 1936 1954 1936 1978 bottom-tenth 2 5.2 17.5 -12.3 2 128 1936 1931,1992 1936 1978 bottom-tenth 3 8.1 18.2 -10.1 2 127 1936 1992 1936 1978 bottom-tenth 4 13.0 21.6 -8.6 2 127 1936 2000 1936 1978 bottom-tenth 5 20.1 26.9 -6.8 2 127 1936 2000 1936 1978 bottom-tenth 6 27.6 32.4 -4.8 3 126 1936 2016 1936 1978 bottom-tenth 1899,1917 7 33.7 37.8 -4.1 6 123 1936 2002 1978 1977 bottom-tenth 1899 8 38.4 42.2 -3.8 5 124 1897,1936 2002 1978 1977 bottom-tenth 1899 9 41.5 44.8 -3.3 7 122 1936 2002 1952 1978 bottom-tenth 1899,1993 10 43.0 45.9 -2.9 9 120 1936 2002 1952 1978 bottom-tenth 11 43.1 45.8 -2.7 7 122 1936 2002 1952 1978 bottom-tenth 1897 12 42.0 44.6 -2.6 10 119 1952 2013 1952 1978 bottom-tenth 18 37.2 40.5 -3.3 2 126 1918 2013 1918 1978 bottom-tenth 24 42.9 44.6 -1.7 13 115 1918,1952 2017 1952 1978 bottom-tenth 36 43.6 44.5 -0.9 19 108 1918 2000,2007,2018 1973 1978 bottom-third 1901,1967,1971,1972,1973 48 44.0 44.5 -0.5 32 94 1918 2008 1973 1978 bottom-third 1909 60 44.3 44.5 -0.2 41 84 1920 2008 1974 1978 bottom-third 1925,1931,1950,1956,1963