1901-2000 Degrees Fahrenheit 1 58.1 59.8 -1.7 29 101 1907 2006 2018 2019 bottom-third 1910,1916,1989 2 58.5 55.3 3.2 115 15 1960 2012 2019 2017 top-third 1948,1974,2021 3 54.5 51.2 3.3 119 11 1958 2012 2019 2017 top-tenth 1911 4 52.4 48.4 4.0 125 5 1978 2017 2019 2017 top-tenth 1921 5 51.5 47.1 4.4 125 4 1978 2017 2019 2017 top-tenth 6 50.7 47.5 3.2 121 8 1940,1978 2017 2019 2017 top-tenth 7 52.5 49.4 3.1 121 8 1978 2017 2019 2017 top-tenth 8 55.8 52.3 3.5 126 3 1977 2017 2019 2017 top-tenth 9 58.4 55.1 3.3 126 3 1977 2017 2019 2017 top-tenth 10 60.5 57.5 3.0 126 3 1977 2017 2019 2017 top-tenth 11 61.9 59.2 2.7 124 5 1977 2017 2019 2017 top-tenth 12 62.7 59.9 2.8 127 2 1977 2017 2019 2017 top-tenth 1999 18 58.1 55.8 2.3 125 3 1978 2017 2019 2017 top-tenth 24 62.4 59.9 2.5 126 2 1978 2017 2019 2017 top-tenth 36 61.6 59.9 1.7 120 7 1970 2018 2016 2019 top-tenth 48 62.2 59.9 2.3 125 1 1980 2020 2019 2020 highest 60 62.2 59.9 2.3 124 1 1980 2020 2019 2020 highest