1925-2000 Degrees Fahrenheit 1 16.9 23.3 -6.4 6 94 1985 2016 1985 1984 bottom-tenth 2 12.5 17.1 -4.6 10 90 1972 2019 1977 1985 bottom-tenth 3 11.9 13.0 -1.1 32 68 1972 2019 1985 1983 bottom-third 1992,2007,2023 4 10.4 10.3 0.1 44 56 1971 2016 1984 1985 normal 1965 5 11.8 9.0 2.8 75 24 1971 2016 1985 1981 top-third 1929,2010 6 11.3 9.4 1.9 68 31 1972 2016 1985 1981 top-third 1963,2004 7 12.6 11.7 0.9 56 43 1971 2016 1985 1981 normal 8 16.0 15.3 0.7 49 50 1971 2019 1985 1983 normal 1968,1983 9 19.7 19.1 0.6 46 53 1971 2019 1985 1983 normal 1927,1983 10 23.0 22.5 0.5 46 53 1971 2019 1985 1983 normal 1983 11 25.2 24.9 0.3 44 55 1971 2019 1985 1985 normal 1985 12 26.1 26.0 0.1 42 57 1971 2016 1985 1985 normal 1930,1985 18 20.7 20.4 0.3 45 53 1972 2016 1985 1985 normal 1963,1985,1992 24 26.1 26.0 0.1 40 58 1972 2019 1985 1982 normal 1928,1968,2000 36 26.0 26.0 0.0 34 63 1973 2016 1985 1985 normal 1932,1963,1985 48 26.0 25.9 0.1 35 61 1974 2019 1985 1985 normal 1985 60 26.0 25.9 0.1 37 58 1975 2019 1978 1985 normal 1962