1991-2020 Degrees Fahrenheit 1 66.4 66.7 -0.3 45 40 1983 2011 1975 1978 normal 2 62.9 63.2 -0.3 48 37 1983 2012 1978 1977 normal 1992 3 57.6 59.6 -2.0 29 56 1947 2017 1978 1977 normal 1966,1988,2013 4 52.7 56.9 -4.2 7 78 1978 2017 1978 1977 bottom-tenth 5 51.8 55.5 -3.7 6 79 1978 2017 1978 1977 bottom-tenth 1964 6 53.2 55.8 -2.6 22 63 1940 2017 1978 1976 bottom-third 1941,1968 7 55.1 57.6 -2.5 17 68 1940 2017 1978 1976 bottom-third 1970,1980 8 58.0 60.3 -2.3 19 66 1977 2017 1978 1976 bottom-third 1970,1982 9 60.8 63.0 -2.2 22 63 1977 2017 1978 1976 bottom-third 10 63.3 65.1 -1.8 22 63 1977 2017 1978 1976 bottom-third 1987 11 64.9 66.6 -1.7 20 64 1977 2017 1978 1976 bottom-third 1987,1988 12 65.7 67.3 -1.6 22 62 1977 2017 1978 1976 bottom-third 1946,1948 18 60.9 63.5 -2.6 7 77 1941 2017 1978 1977 bottom-tenth 1959,1961,1962 24 65.4 67.3 -1.9 16 67 1978 2017 1978 1976 bottom-third 1963,1968,1985 36 64.6 67.2 -2.6 1 81 1979 2018 1979 1978 lowest 48 65.2 67.2 -2.0 5 76 1980 2019 1978 1977 bottom-tenth 1963,1971,1985 60 65.2 67.2 -2.0 4 76 1962 2020 1977 1978 bottom-tenth 1963,1977,1984