1991-2020 Degrees Fahrenheit 1 43.8 38.4 5.4 78 6 1960 2012 1999 1973 top-tenth 2 38.8 33.5 5.3 81 3 1978 2012 1999 1976 top-tenth 1976 3 33.4 30.8 2.6 74 10 1978 2012 1999 1998 top-third 1953 4 32.9 30.7 2.2 75 9 1978 2012 1999 1998 top-third 1992 5 35.4 32.9 2.5 76 7 1978 2012 1999 1998 top-tenth 6 38.2 36.3 1.9 75 7 1978 2012 1999 1998 top-tenth 7 41.9 40.3 1.6 74 8 1977,1978 2012,2016,2017 1999 1998 top-tenth 1983,1998 8 45.4 44.2 1.2 74 8 1977 2017 1999 1954 top-tenth 1954 9 49.1 47.5 1.6 73 8 1977 2012 1999 2000 top-tenth 10 51.3 49.8 1.5 73 8 1977 2012 1999 2000 top-tenth 11 52.3 50.8 1.5 76 5 1977 2012 1999 2000 top-tenth 2006,2020 12 52.2 50.7 1.5 75 6 1977 2012 1999 1992 top-tenth 1992 18 47.2 45.9 1.3 72 7 1978 2017 1998 1999 top-tenth 2022 24 52.0 50.7 1.3 74 5 1978 2017 1999 2000 top-tenth 36 51.4 50.7 0.7 70 7 1979 2018 1999 2000 top-tenth 2008 48 50.8 50.7 0.1 63 12 1980 2019 1999 1992 top-third 1992,2001,2007 60 50.4 50.6 -0.2 53 20 1981 2020 1999 1992 top-third 1990,1991