1991-2020 Degrees Fahrenheit 1 24.6 30.7 -6.1 14 61 1955 1999 1985 1984 bottom-third 2 35.1 37.5 -2.4 20 55 1985 1963 1985 1984 bottom-third 3 40.8 44.5 -3.7 7 68 1985 1963 1985 1984 bottom-tenth 4 47.2 50.6 -3.4 5 70 1985 1963 1985 1984 bottom-tenth 5 51.1 54.4 -3.3 4 71 1985 1963 1985 1984 bottom-tenth 6 53.7 55.8 -2.1 8 66 1985 2021 1985 1984 bottom-third 1965,2019 7 53.7 55.4 -1.7 10 64 1951,1993 1988 1985 1984 bottom-third 2009 8 52.2 53.8 -1.6 12 62 1950 1988 1985 1984 bottom-third 1975,1982 9 50.8 51.2 -0.4 38 36 1951 1988 1985 1984 normal 1960,1968 10 47.2 48.1 -0.9 30 44 1951 1988 1985 1984 normal 1960,1995,2022 11 45.0 45.2 -0.2 43 31 1950 1987 1985 1984 normal 2004 12 42.5 43.2 -0.7 34 39 1950 1987 1985 1984 normal 1974 18 45.3 47.4 -2.1 19 53 1951 1988,1998 1982 1985 bottom-third 24 41.6 43.1 -1.5 23 48 1951 1988 1979 1985 bottom-third 1959,1978 36 42.1 43.1 -1.0 29 40 1952 2000 1980 1985 normal 1961,1975 48 43.1 43.2 -0.1 45 22 1952 1990 1985 1984 top-third 2009 60 42.3 43.3 -1.0 30 35 1953 1991 1982 1985 normal 1980