1901-2000 Degrees Fahrenheit 1 67.2 72.0 -4.8 2 127 1976 1933 1971 1970 bottom-tenth 2 64.7 68.2 -3.5 2 127 1961 1896 1961 1970 bottom-tenth 1983,1997 3 60.4 64.4 -4.0 1 128 1971 2012 1971 1970 lowest 4 57.2 60.9 -3.7 1 128 1971 1927 1971 1970 lowest 5 55.2 58.1 -2.9 8 121 1978 2017 1968 1970 bottom-tenth 6 54.5 56.5 -2.0 14 114 1978 2017 1970 1967 bottom-third 1981 7 53.9 56.3 -2.4 10 118 1977 2017 1970 1968 bottom-tenth 8 55.3 57.4 -2.1 10 118 1977 2017 1970 1967 bottom-tenth 1960 9 57.9 59.5 -1.6 13 115 1977 2017 1970 1967 bottom-tenth 1899,1915,1931,1981,1996 10 60.1 61.5 -1.4 14 114 1977 2017 1970 1967 bottom-third 1915,1931 11 61.9 63.3 -1.4 12 116 1977 2017 1970 1967 bottom-tenth 1899 12 63.1 64.6 -1.5 10 118 1977 2017 1970 1967 bottom-tenth 1980 18 60.0 61.9 -1.9 5 122 1977 2017 1970 1967 bottom-tenth 24 62.8 64.6 -1.8 5 122 1969 2017 1970 1968 bottom-tenth 1968 36 62.7 64.6 -1.9 2 124 1970 2018,2019 1970 1969 bottom-tenth 1969,1978 48 62.5 64.6 -2.1 1 124 1971 2020 1971 1970 lowest 60 62.7 64.6 -1.9 1 123 1971 2020 1971 1970 lowest