1901-2000 Degrees Fahrenheit 1 57.3 59.8 -2.5 19 110 1907 2006 1973 1979 bottom-third 1951,1973 2 52.1 55.3 -3.2 8 121 1960 2012 1969 1979 bottom-tenth 3 47.0 51.2 -4.2 5 124 1958 2012 1978 1979 bottom-tenth 4 45.7 48.4 -2.7 15 114 1978 2017 1979 1977 bottom-third 1947 5 45.0 47.1 -2.1 18 110 1978 2017 1979 1977 bottom-third 1963,1977,1996,2014 6 45.6 47.5 -1.9 23 105 1940,1978 2017 1978 1979 bottom-third 7 47.6 49.4 -1.8 19 109 1978 2017 1978 1979 bottom-third 2014 8 50.3 52.3 -2.0 14 114 1977 2017 1978 1979 bottom-third 9 53.2 55.1 -1.9 8 120 1977 2017 1978 1979 bottom-tenth 1899,1940 10 55.7 57.5 -1.8 8 120 1977 2017 1978 1979 bottom-tenth 11 57.3 59.2 -1.9 6 122 1977 2017 1978 1979 bottom-tenth 12 58.0 59.9 -1.9 4 124 1977 2017 1977 1979 bottom-tenth 18 54.3 55.8 -1.5 8 119 1978 2017 1979 1976 bottom-tenth 1902,1905,1961,1962 24 58.7 59.9 -1.2 7 120 1978 2017 1978 1979 bottom-tenth 1918,1959 36 58.6 59.9 -1.3 6 120 1970 2018 1979 1976 bottom-tenth 48 58.0 59.9 -1.9 1 124 1980 2020 1980 1979 lowest 60 58.4 59.9 -1.5 1 123 1980 2020 1980 1979 lowest