1991-2020 Degrees Fahrenheit 1 26.4 16.7 9.7 72 4 1950 2006 2020 2006 top-tenth 2 27.6 18.3 9.3 73 2 1950 1992 2020 1992 top-tenth 3 30.4 22.4 8.0 74 1 1956 2021 2020 2021 highest 4 32.2 27.9 4.3 71 4 1952 2000 2020 2012 top-tenth 5 37.4 34.1 3.3 69 6 1952 2000 2020 2016 top-tenth 2002 6 43.0 39.9 3.1 72 3 1952 2000 2020 2012 top-tenth 2012 7 46.9 44.2 2.7 70 5 1952 2022 2020 2012 top-tenth 2012 8 49.2 46.5 2.7 71 3 1952 2022 2020 1989 top-tenth 9 49.6 47.2 2.4 69 5 1952 1989 2020 2002 top-tenth 1992,2000 10 48.5 46.7 1.8 63 11 1952 1989 2020 2016 top-third 11 47.1 45.3 1.8 63 11 1952 1989 2020 2016 top-third 12 45.2 43.2 2.0 65 9 1952 2000 2020 2016 top-third 2016 18 43.0 42.1 0.9 58 15 1952 2000 2020 2017 top-third 1964 24 42.4 43.2 -0.8 33 39 1952 1989 2020 2019 normal 1962 36 42.1 43.2 -1.1 31 39 1952 2000 2020 2019 normal 1962,1978 48 42.5 43.3 -0.8 36 32 1953 2001,2002 2020 2019 normal 1977 60 42.9 43.4 -0.5 42 24 1954 2002 2020 2020 normal 1986,1987,1999,2020