1901-2000 Degrees Fahrenheit 1 71.0 72.0 -1.0 40 89 1976 1896 1968 1966 bottom-third 1939,1966,1979,1990 2 68.3 68.2 0.1 59 70 1997 1896 1968 1967 normal 1895,1945,1979 3 62.1 64.6 -2.5 9 120 1983 2012 1960 1968 bottom-tenth 4 58.8 61.0 -2.2 15 114 1960 2012 1968 1967 bottom-third 2013 5 56.2 58.3 -2.1 16 113 1940 2012 1968 1967 bottom-third 1970,1979 6 54.2 56.7 -2.5 6 122 1978 2017 1958 1968 bottom-tenth 7 53.9 56.5 -2.6 4 124 1940 2017 1940 1968 bottom-tenth 1970 8 55.3 57.6 -2.3 5 123 1977 2017 1958 1968 bottom-tenth 1931 9 57.4 59.7 -2.3 6 122 1977 2017 1968 1967 bottom-tenth 1970 10 59.6 61.7 -2.1 7 121 1977 2017 1968 1967 bottom-tenth 11 61.4 63.4 -2.0 4 124 1977 2017 1968 1967 bottom-tenth 1958,1978 12 63.0 64.7 -1.7 5 123 1977 2017 1968 1967 bottom-tenth 1970 18 60.3 62.0 -1.7 4 123 1970,1977 2017 1969 1968 bottom-tenth 24 62.5 64.7 -2.2 1 126 1969,1978 2017 1969 1968 lowest 1978 36 63.2 64.7 -1.5 4 122 1970 2019 1969 1968 bottom-tenth 1979 48 63.4 64.7 -1.3 5 120 1971 2020 1969 1968 bottom-tenth 1979 60 63.6 64.7 -1.1 7 117 1971 2020 1969 1968 bottom-tenth