1991-2020 Degrees Fahrenheit 1 66.1 69.8 -3.7 26 95 1969 2020 1931 1930 bottom-third 1933 2 67.9 68.3 -0.4 81 39 1958 2020 1931 1929 top-third 3 68.1 66.9 1.2 96 19 1958 2020 1930 1929 top-third 4 69.1 66.9 2.2 105 6 1958 2017 1930 1913 top-tenth 5 69.4 67.7 1.7 100 9 1958 2020 1930 1932 top-tenth 2021 6 70.6 69.4 1.2 96 13 1958 2020 1930 1932 top-third 7 72.0 71.1 0.9 95 13 1958 2020 1930 1932 top-third 8 73.3 72.6 0.7 95 13 1958 2020 1930 1932 top-third 9 74.3 73.7 0.6 95 13 1958,1969 2020 1930 1932 top-third 10 74.8 74.5 0.3 94 14 1969 2020 1930 1932 top-third 1989 11 74.8 74.9 -0.1 89 19 1969 2020 1930 1913 top-third 1913 12 74.5 74.8 -0.3 86 21 1969 2020 1930 1913 top-third 1987 18 -99 72.9 -99 -99 -99 1978 2021 normal 24 -99 74.7 -99 -99 -99 1978 2021 normal 36 -99 74.5 -99 -99 -99 1970 2022 normal 48 -99 74.5 -99 -99 -99 1969,1970,1971 2022 normal 60 -99 74.5 -99 -99 -99 1970 2017 normal