1901-2000 Degrees Fahrenheit 1 48.8 50.8 -2.0 36 94 1960 2012 1969 1968 bottom-third 1900,1920 2 44.7 46.9 -2.2 28 102 1960 2012 1969 1967 bottom-third 1942,2014 3 41.2 44.6 -3.4 18 112 1978 2012 1969 1967 bottom-third 1977 4 40.8 43.9 -3.1 15 114 1978 2012,2020 1969 1968 bottom-third 5 42.0 45.1 -3.1 10 119 1978 2017 1963 1969 bottom-tenth 1963 6 45.0 47.7 -2.7 11 118 1977 2017 1960 1969 bottom-tenth 7 48.5 51.2 -2.7 7 122 1977 2017 1968 1969 bottom-tenth 8 51.9 54.6 -2.7 6 123 1977 2017 1968 1969 bottom-tenth 9 55.2 57.3 -2.1 8 121 1977 2017 1968 1969 bottom-tenth 10 57.2 59.1 -1.9 7 122 1977 2017 1968 1969 bottom-tenth 1902 11 58.1 59.9 -1.8 5 124 1977 2017 1969 1969 bottom-tenth 1902,1969,1978,1980,2010 12 58.4 59.9 -1.5 10 119 1977 2017 1969 1967 bottom-tenth 1958,1984 18 54.0 55.8 -1.8 4 124 1978 2017 1969 1968 bottom-tenth 1941 24 58.3 59.9 -1.6 4 124 1978 2017 1969 1968 bottom-tenth 36 58.1 59.9 -1.8 2 125 1979 2018 1970 1969 bottom-tenth 48 58.4 59.9 -1.5 2 124 1980 2020 1970 1969 bottom-tenth 1971,1978 60 58.8 59.9 -1.1 5 120 1981 2020 1962 1969 bottom-tenth 1962