1991-2020 Degrees Fahrenheit 1 24.0 23.5 0.5 47 38 1949 2006 1985 1986 normal 2 21.7 23.4 -1.7 28 56 1949 1958 1986 1983 bottom-third 1982,2004,2023 3 24.4 26.8 -2.4 29 55 1979 2021 1986 1983 normal 4 29.8 31.7 -1.9 28 55 1979 2000 1986 1983 normal 5 34.2 37.2 -3.0 18 65 1979 2022 1986 1983 bottom-third 6 40.0 42.6 -2.6 19 64 1986 2021 1986 1984 bottom-third 1947 7 43.6 46.7 -3.1 13 70 1979 2022 1986 1984 bottom-third 8 46.5 48.7 -2.2 20 63 1952,1979 2022 1986 1983 bottom-third 1942,1945,1947,1960,1966 9 47.4 49.3 -1.9 22 61 1979 2022 1986 1983 bottom-third 10 47.0 48.9 -1.9 21 62 1952 2022 1986 1983 bottom-third 1957,1993,2010 11 46.7 47.8 -1.1 32 49 1952 2016 1986 1983 normal 1977,1983,1993 12 44.7 46.1 -1.4 27 54 1952 2016 1986 1984 bottom-third 1963 18 41.6 44.9 -3.3 4 75 1952 2013,2022 1986 1985 bottom-tenth 24 43.6 46.0 -2.4 7 70 1950 2017 1986 1985 bottom-tenth 36 43.7 46.0 -2.3 5 68 1952 2018 1953 1986 bottom-tenth 1945 48 44.0 46.0 -2.0 6 63 1952 2019 1979 1986 bottom-tenth 60 44.2 46.0 -1.8 6 59 1952,1953 2008,2009,2020 1980 1986 bottom-tenth 1950,1973