1991-2020 Degrees Fahrenheit 1 33.2 38.7 -5.5 17 85 1960 2012 1984 1992 bottom-third 2 28.9 34.6 -5.7 10 92 1934 2012 1978 1992 bottom-tenth 3 29.6 32.4 -2.8 31 69 1978 2012,2020 1988 1992 bottom-third 1981 4 30.1 32.6 -2.5 42 58 1978 2012 1988 1992 normal 5 32.3 34.5 -2.2 39 59 1934 2012 1988 1992 normal 1931,1958,1988 6 34.7 37.5 -2.8 28 69 1934 2012 1984 1992 bottom-third 1943,1965,1984 7 38.5 41.3 -2.8 22 75 1934 2012 1982 1992 bottom-third 8 42.1 45.1 -3.0 17 80 1963 2012 1982 1992 bottom-third 1935 9 45.2 48.3 -3.1 15 82 1963 2012 1982 1992 bottom-third 1979 10 47.3 50.3 -3.0 14 83 1963 2012 1982 1992 bottom-third 11 48.2 51.2 -3.0 14 83 1941 2012 1982 1992 bottom-third 12 48.0 51.1 -3.1 11 86 1941 2012 1978 1992 bottom-third 1978 18 44.5 46.5 -2.0 30 63 1941 2017 1983 1992 bottom-third 1947,1997 24 49.7 51.0 -1.3 51 42 1926,1941 2017,2021 1989 1992 normal 1943,1951,1976,1984 36 50.1 51.0 -0.9 60 29 1941,1979 2022 1990 1992 top-third 1933,2005 48 50.1 50.9 -0.8 58 28 1980 2023 1991 1992 top-third 1956 60 50.0 50.9 -0.9 55 28 1944 2023 1991 1992 normal 1953,1954,1956