1991-2020 Degrees Fahrenheit 1 58.4 56.0 2.4 70 5 2006 2022 2020 2019 top-tenth 2 61.5 59.8 1.7 69 6 1950 2022 2020 2019 top-tenth 2013 3 63.6 61.7 1.9 72 3 1950 2022 2020 2011 top-tenth 4 63.5 61.5 2.0 74 1 1950 2021 2020 2021 highest 5 61.2 59.6 1.6 72 3 1950 2018,2022 2020 2018 top-tenth 6 58.1 56.8 1.3 71 4 1968,1975 2018 2020 2020 top-tenth 2020 7 54.7 53.7 1.0 68 7 1950 2012 2019 2020 top-tenth 2011,2022 8 51.1 50.1 1.0 68 7 1979 2018 2019 2020 top-tenth 9 47.5 46.4 1.1 66 9 1984 2018 2019 2020 top-third 10 44.5 43.6 0.9 61 12 1979 2018 2019 2020 top-third 1999 11 43.5 42.4 1.1 64 9 1973 2018 2019 2020 top-third 1981,1999,2003,2005 12 43.7 42.5 1.2 65 8 1973 2018 2020 2018 top-third 2012 18 48.5 47.2 1.3 68 5 1973,1984,1992 2018 2020 2018 top-tenth 24 43.5 42.5 1.0 62 9 1993 2018 2020 2019 top-third 36 43.0 42.4 0.6 57 12 1975 2018 2013 2020 top-third 48 43.7 42.3 1.4 64 3 1976 2019 2013 2020 top-tenth 60 43.9 42.2 1.7 64 1 1977 2020,2021 2020 2020 highest 2020