1901-2000 Degrees Fahrenheit 1 59.8 59.3 0.5 68 62 1915 2020 1920 1922 normal 1909 2 56.8 56.1 0.7 71 59 2010 2023 1920 1922 normal 3 56.2 54.1 2.1 99 31 1978 2023 1920 1922 top-third 2018 4 56.7 53.4 3.3 116 13 1978 2017 1922 1907 top-tenth 1952 5 57.6 54.2 3.4 118 11 1977 2017 1922 1907 top-tenth 1957 6 59.3 56.4 2.9 120 9 1977 2017 1922 1923 top-tenth 1957 7 62.1 59.4 2.7 122 7 1977 2017 1921 1922 top-tenth 1999 8 64.4 62.1 2.3 121 8 1977 2017 1921 1922 top-tenth 1999 9 66.3 64.2 2.1 120 9 1977 2017 1921 1922 top-tenth 2019,2023 10 67.8 65.8 2.0 119 10 1977 2017 1921 1922 top-tenth 1907,1950 11 68.5 66.5 2.0 122 7 1977 2017,2020 1922 1922 top-tenth 1922,1950,2019 12 68.6 66.5 2.1 123 6 1977 2017,2020 1922 1923 top-tenth 18 65.4 63.1 2.3 124 4 1978 2017 1922 1923 top-tenth 24 68.4 66.5 1.9 123 5 1978 2017 1922 1923 top-tenth 36 67.9 66.5 1.4 120 7 1978,1979 2018 1922 1923 top-tenth 48 67.8 66.5 1.3 119 7 1980 2020 1922 1923 top-tenth 60 67.5 66.5 1.0 119 6 1981 2020 1922 1923 top-tenth 2018