1991-2020 Degrees Fahrenheit 1 59.4 55.8 3.6 64 11 1976 1985 1960 1958 top-third 2 61.5 60.9 0.6 53 22 1976 1985 1960 1960 top-third 1960,2018 3 66.4 66.0 0.4 54 21 1967 1985 1959 1960 top-third 1970 4 69.7 69.9 -0.2 46 29 1967 2016 1957 1960 normal 1977,1984 5 71.9 72.4 -0.5 41 34 1967 2016 1957 1960 normal 1949,1982,2022 6 72.7 73.6 -0.9 29 46 1967 2016 1957 1960 normal 1957,1988,2001 7 72.3 73.4 -1.1 17 58 1967 2016 1961 1960 bottom-third 1964,1965,1988 8 70.7 72.3 -1.6 8 67 1967,1976 2016 1961 1960 bottom-third 9 69.5 70.7 -1.2 14 61 1976 2016 1950 1960 bottom-third 1974,1981 10 67.9 68.7 -0.8 28 47 1967 2016 1960 1959 normal 1963,1980 11 65.6 66.8 -1.2 20 54 1966 2019 1960 1960 bottom-third 1960,1963 12 63.7 65.5 -1.8 7 67 1966,1969 2016 1961 1960 bottom-tenth 1970,1979,1981,1996,2014 18 67.0 68.2 -1.2 15 58 1968 2017 1958 1960 bottom-third 1958,1984,1993,1997 24 63.9 65.4 -1.5 8 64 1967 2017 1961 1960 bottom-third 1965,1966,1976 36 64.2 65.4 -1.2 14 56 1968,1969 2018 1961 1960 bottom-third 1963,1972 48 64.2 65.3 -1.1 12 56 1969 2019 1961 1960 bottom-third 1963,1965,1980,1982,1984 60 64.7 65.3 -0.6 24 42 1970 2020 1961 1960 normal 1974,1976