1991-2020 Degrees Fahrenheit 1 54.5 55.6 -1.1 33 42 2006 2022 1976 1977 normal 2 56.9 59.3 -2.4 11 64 1968,1974 2022 1976 1977 bottom-third 1971,1975 3 59.4 61.2 -1.8 19 56 1950 2022 1976 1977 bottom-third 2004 4 59.5 61.0 -1.5 23 52 1950 2021 1976 1977 bottom-third 1948,1951 5 57.0 59.1 -2.1 15 60 1950 2022 1976 1977 bottom-third 1974 6 54.5 56.3 -1.8 21 54 1968,1975 2022 1976 1977 bottom-third 1961,1986,1993 7 51.7 53.3 -1.6 33 42 1975 2020 1976 1977 normal 1991 8 48.3 49.6 -1.3 40 35 1979 2020 1977 1972 normal 9 45.4 46.0 -0.6 48 27 1984 2018 1977 1972 normal 10 43.2 43.1 0.1 54 19 1979 2018 1977 1954 top-third 1954,1986 11 42.2 41.9 0.3 56 17 1973 2018 1977 1978 top-third 12 42.3 42.0 0.3 56 17 1973 2018 1977 1978 top-third 2007 18 46.8 46.8 0.0 54 19 1984 2018 1977 1978 top-third 2004 24 41.0 42.0 -1.0 39 32 1993 2018 1977 1967 normal 1951,1956,1959 36 40.7 41.9 -1.2 37 32 1975 2018 1977 1959 normal 48 40.1 41.8 -1.7 18 49 1976 2019,2020 1977 1972 bottom-third 1987 60 40.0 41.7 -1.7 14 51 1977 2020,2021,2022 1977 1972 bottom-third 1966,1969,1980