1901-2000 Degrees Fahrenheit 1 63.4 59.8 3.6 115 15 1907 2006 1976 1967 top-third 2 59.2 55.3 3.9 121 9 1960 2012 1976 1967 top-tenth 2006 3 53.3 51.2 2.1 101 29 1958 2012 1975 1976 top-third 4 46.8 48.4 -1.6 32 98 1978 2017 1971 1976 bottom-third 1984 5 45.0 47.1 -2.1 18 111 1978 2017 1969 1976 bottom-third 1963,1980,1996,2014 6 44.5 47.5 -3.0 5 124 1940,1978 2017 1940 1976 bottom-tenth 7 45.9 49.4 -3.5 2 127 1978 2017 1977 1976 bottom-tenth 8 48.7 52.3 -3.6 1 128 1977 2017 1977 1976 lowest 9 51.6 55.1 -3.5 1 128 1977 2017 1977 1976 lowest 10 54.1 57.5 -3.4 1 128 1977 2017 1977 1976 lowest 11 55.8 59.2 -3.4 1 128 1977 2017 1977 1976 lowest 12 56.4 59.9 -3.5 1 128 1977 2017 1977 1976 lowest 18 53.9 55.8 -1.9 2 126 1978 2017 1977 1976 bottom-tenth 24 58.2 59.9 -1.7 3 125 1978 2017 1969 1976 bottom-tenth 36 58.4 59.9 -1.5 4 123 1970 2018 1970 1976 bottom-tenth 48 59.2 59.9 -0.7 12 114 1980 2020 1972 1976 bottom-tenth 1905,1965,1968,1972,1982,1983,1985 60 59.2 59.9 -0.7 15 110 1980 2020 1972 1976 bottom-third 1965,1983