1901-2000 Degrees Fahrenheit 1 67.3 68.7 -1.4 40 89 1976 1896 1976 1977 bottom-third 1966,2011 2 64.6 64.6 0.0 55 74 1907 1896 1976 1977 normal 1909,1949,1952,1954,1974,1975 3 58.9 60.4 -1.5 22 107 1960,1971 2012 1971 1977 bottom-third 4 52.8 56.4 -3.6 4 125 1960 2012 1971 1977 bottom-tenth 5 48.6 53.3 -4.7 1 128 1978 2012 1978 1977 lowest 6 47.4 51.7 -4.3 1 127 1978 2012,2017 1978 1977 lowest 7 48.2 51.5 -3.3 1 127 1978 2017 1978 1977 lowest 8 49.3 52.8 -3.5 1 127 1978 2017 1978 1977 lowest 9 52.0 55.0 -3.0 2 126 1977 2017 1977 1976 bottom-tenth 10 54.6 57.4 -2.8 3 125 1977 2017 1977 1976 bottom-tenth 11 57.0 59.4 -2.4 3 125 1977 2017 1977 1976 bottom-tenth 1958 12 58.7 60.8 -2.1 3 125 1977 2017 1977 1976 bottom-tenth 1958 18 55.7 57.7 -2.0 3 124 1977 2017 1977 1976 bottom-tenth 1979 24 58.1 60.8 -2.7 1 126 1978 2017 1978 1977 lowest 36 58.6 60.8 -2.2 2 124 1970 2018,2019 1970 1977 bottom-tenth 48 58.9 60.7 -1.8 3 122 1971,1980 2020 1971 1977 bottom-tenth 1979 60 59.6 60.7 -1.1 10 114 1980 2020 1972 1977 bottom-tenth 1964,1969