1991-2020 Degrees Fahrenheit 1 41.3 38.7 2.6 88 14 1960 2012 1989 1979 top-third 2 37.8 34.6 3.2 95 7 1934 2012 1989 1990 top-tenth 3 36.9 32.4 4.5 95 5 1978 2012,2020 1989 1990 top-tenth 4 32.5 32.6 -0.1 73 27 1978 2012 1989 1983 top-third 1992,2018 5 34.0 34.5 -0.5 67 31 1934 2012 1989 1985 top-third 6 37.2 37.5 -0.3 67 30 1934 2012 1989 1985 top-third 7 40.9 41.3 -0.4 68 29 1934 2012 1989 1985 top-third 1992 8 44.5 45.1 -0.6 66 31 1963 2012 1989 1985 top-third 9 47.4 48.3 -0.9 65 32 1963 2012 1989 1985 top-third 2011 10 49.5 50.3 -0.8 65 32 1963 2012 1989 1985 top-third 11 50.2 51.2 -1.0 64 33 1941 2012 1989 1985 normal 1942,2004 12 49.9 51.1 -1.2 60 37 1941 2012 1989 1986 normal 1956,1981,2003 18 45.2 46.5 -1.3 53 40 1941 2017 1989 1986 normal 1956,1958,1981,1985 24 49.9 51.0 -1.1 56 37 1926,1941 2017,2021 1989 1986 normal 1974,1975,1985 36 49.7 51.0 -1.3 47 42 1941,1979 2022 1989 1987 normal 1950,1975 48 49.6 50.9 -1.3 38 48 1980 2023 1985 1989 normal 1957,1974,1975 60 49.7 50.9 -1.2 45 38 1944 2023 1988 1989 normal 1955,1976,1988