1991-2020 Degrees Fahrenheit 1 58.8 56.5 2.3 81 5 1949 2003 1999 1986 top-tenth 2 57.4 56.0 1.4 78 8 1949 2018 1999 1986 top-tenth 1986 3 61.2 58.9 2.3 82 3 1949 2018 1999 2000 top-tenth 4 65.9 63.4 2.5 82 2 1949 2018 1999 2000 top-tenth 5 70.4 68.5 1.9 82 2 1973 2018 1999 2000 top-tenth 2021 6 74.3 72.7 1.6 81 3 1972 2018 1999 2000 top-tenth 7 76.8 75.9 0.9 79 5 1942,1985 2021 1999 1996 top-tenth 2020,2022 8 78.4 77.8 0.6 75 9 1942 2018 1999 2000 top-third 2002,2008,2014 9 78.7 78.2 0.5 71 12 1942 2021 1999 2000 top-third 10 77.5 77.7 -0.2 61 21 1942 2021 1999 1997 top-third 1959,2016 11 76.4 76.6 -0.2 59 23 1942 2018 1999 1998 top-third 12 75.1 75.2 -0.1 62 20 1942 2018 1999 1998 top-third 1996,2006 18 74.3 74.4 -0.1 60 20 1945 2018 1999 1998 top-third 1998 24 74.1 75.2 -1.1 48 30 1943,1966 2018 1999 1999 normal 1982,1999 36 74.5 75.2 -0.7 48 28 1944,1945,1967 2018,2019 1996 1999 normal 1992 48 74.8 75.2 -0.4 51 23 1945 2018 1999 1999 top-third 1999 60 74.9 75.1 -0.2 51 21 1976 2018,2019 1999 2000 top-third 2001,2003