1901-2000 Degrees Fahrenheit 1 43.5 48.4 -4.9 13 117 1960 2012 1969 1970 bottom-tenth 1996 2 40.7 44.3 -3.6 20 110 1947 2012 1969 1970 bottom-third 3 39.1 41.9 -2.8 23 107 1978 2012 1970 1967 bottom-third 1915,1980 4 40.0 41.3 -1.3 35 94 1978 2012 1970 1967 bottom-third 1966,1982 5 41.1 42.5 -1.4 30 99 1978 2012 1970 1967 bottom-third 1931,1941 6 44.2 45.2 -1.0 34 95 1977 2017 1970 1967 bottom-third 1906,1941,1988 7 48.4 48.8 -0.4 45 84 1977 1932,2017 1970 1967 normal 1967 8 51.9 52.2 -0.3 44 85 1977 2017 1970 1962 normal 1944,1962 9 54.5 55.0 -0.5 40 89 1977 2017 1970 1967 bottom-third 1988,1994 10 56.2 56.9 -0.7 35 94 1977 2017 1970 1967 bottom-third 1966 11 57.2 57.7 -0.5 37 92 1977 2017 1970 1966 bottom-third 1961,1985,1994,1998 12 57.4 57.7 -0.3 43 86 1977 2017 1970 1966 bottom-third 1912,1961,1965,1973 18 52.2 53.5 -1.3 13 115 1978 2017 1970 1967 bottom-tenth 24 56.7 57.7 -1.0 12 116 1978 2017 1970 1967 bottom-tenth 1906,1919,1959,1979,1980,1985,1994 36 56.5 57.7 -1.2 7 120 1979 2018 1970 1968 bottom-tenth 1906,1980 48 56.2 57.7 -1.5 3 123 1980 2020 1970 1969 bottom-tenth 60 56.4 57.7 -1.3 3 122 1981 2020 1970 1970 bottom-tenth 1970,1979