1991-2020 Degrees Fahrenheit 1 46.6 47.0 -0.4 48 35 1976 2015 1981 1982 normal 1988 2 51.5 52.4 -0.9 41 42 1976 1975 1981 1982 normal 3 57.3 58.1 -0.8 47 36 1976 2015 1982 1975 normal 4 62.2 62.7 -0.5 55 28 1940 2015 1982 1975 normal 1961,1968 5 65.3 65.8 -0.5 57 26 1940 2016 1982 1975 top-third 1990,2009 6 66.3 67.0 -0.7 52 30 1976 2016,2020 1982 1975 normal 1990,1993 7 65.6 66.6 -1.0 47 35 1967 2015 1982 1980 normal 1994,1995,2003 8 63.8 65.0 -1.2 38 44 1967 2010,2015 1982 1980 normal 1957,1990,2003 9 61.6 62.6 -1.0 47 34 1967 2010 1982 1979 normal 1975,1979,2003 10 58.9 59.9 -1.0 48 33 1967 2016 1982 1977 normal 1957,1971 11 56.6 57.4 -0.8 49 32 1967 2020 1982 1975 normal 12 55.3 55.9 -0.6 55 26 1978,1996 2016 1982 1975 top-third 18 58.4 59.5 -1.1 46 33 1963 2016 1982 1975 normal 1952,1960,1971,1990 24 54.2 55.8 -1.6 36 42 1963 2017 1982 1976 normal 36 53.7 55.8 -2.1 19 56 1963 2021,2022 1982 1981 bottom-third 1958,1981,1984 48 53.9 55.7 -1.8 18 54 1964,1965 2022 1982 1977 bottom-third 60 53.9 55.7 -1.8 15 54 1965,1967 2020 1982 1978 bottom-third 1973,1978,1985,1996