1991-2020 Degrees Fahrenheit 1 52.5 55.6 -3.1 12 63 2006 2022 1987 1984 bottom-third 2 57.7 59.3 -1.6 26 49 1968,1974 2022 1987 1984 normal 2004,2009 3 59.6 61.2 -1.6 22 53 1950 2022 1987 1984 bottom-third 4 59.9 61.0 -1.1 35 40 1950 2021 1987 1984 normal 5 57.8 59.1 -1.3 31 44 1950 2022 1987 1984 normal 1964 6 55.1 56.3 -1.2 33 42 1968,1975 2022 1987 1984 normal 1959 7 51.6 53.3 -1.7 31 44 1975 2020 1987 1986 normal 1969 8 47.2 49.6 -2.4 16 59 1979 2020 1984 1987 bottom-third 1953,1970 9 42.3 46.0 -3.7 8 67 1984 2018 1984 1987 bottom-third 10 39.5 43.1 -3.6 8 65 1979 2018 1984 1987 bottom-third 1964 11 38.2 41.9 -3.7 8 65 1973 2018 1984 1987 bottom-third 1968 12 38.8 42.0 -3.2 9 64 1973 2018 1984 1987 bottom-third 18 44.0 46.8 -2.8 8 65 1984 2018 1984 1987 bottom-third 24 39.5 42.0 -2.5 11 60 1993 2018 1985 1987 bottom-third 1966 36 40.3 41.9 -1.6 21 48 1975 2018 1986 1987 bottom-third 1953,1964,1969,1972,1981 48 40.4 41.8 -1.4 24 43 1976 2019,2020 1987 1984 normal 1952,1953,1955,1963,1969,1982,1984,1990,1991 60 39.8 41.7 -1.9 9 56 1977 2020,2021,2022 1979 1987 bottom-third 1965,1973,1992,1995