1991-2020 Degrees Fahrenheit 1 26.4 16.5 9.9 73 3 1950 2006 2020 2006 top-tenth 2 27.6 18.2 9.4 73 2 1950 1992 2020 1992 top-tenth 3 30.4 22.2 8.2 74 1 1956,1979 2021 2020 2021 highest 4 32.2 27.8 4.4 72 3 1952 2000 2020 2012 top-tenth 5 37.4 33.9 3.5 72 3 1952 2012 2020 2016 top-tenth 6 43.0 39.7 3.3 73 2 1952 2012 2020 2012 top-tenth 7 46.9 44.0 2.9 72 3 1952 2022 2020 2012 top-tenth 8 49.2 46.3 2.9 72 2 1952 2022 2020 2021 top-tenth 9 49.6 47.0 2.6 71 3 1952 1989 2020 1989 top-tenth 10 48.5 46.5 2.0 65 9 1952 1989 2020 2016 top-third 1999 11 47.1 45.1 2.0 64 9 1952 1989 2020 2016 top-third 2008 12 45.2 43.0 2.2 66 7 1952 1989 2020 2016 top-tenth 18 43.0 41.9 1.1 59 13 1952 2013 2020 2017 top-third 1981,2001 24 42.4 43.0 -0.6 40 31 1952 1989 2020 2019 normal 1954,1978 36 42.3 43.0 -0.7 39 30 1953 1989 2020 2019 normal 1986 48 42.7 43.1 -0.4 44 23 1954 1992,2001,2002 2020 2019 normal 1995 60 43.0 43.1 -0.1 47 18 1969 1992 2020 2020 top-third 2000,2020