1925-2000 Degrees Fahrenheit 1 31.8 25.5 6.3 94 5 1996 2013 2001 1938 top-tenth 2 37.3 33.0 4.3 92 7 1992 2018 2001 1938 top-tenth 1926 3 41.2 38.5 2.7 89 10 1996 2018 2001 1979 top-tenth 4 44.3 42.1 2.2 88 11 1970 2019 2001 1979 top-third 1938,1977,2005,2006,2009 5 45.4 43.5 1.9 84 15 1970 2019 2001 1993 top-third 1925,1977,2009 6 44.7 42.6 2.1 85 14 1965,1970 2019 2001 1995 top-third 2007 7 41.4 39.8 1.6 72 27 1985 2016,2019 2001 1998 top-third 1936,1991 8 38.1 36.2 1.9 81 18 1971 2019 2001 1998 top-third 9 34.9 32.7 2.2 83 16 1971 2019 2001 1998 top-third 1995 10 32.3 29.6 2.7 85 14 1971 2016 2001 1993 top-third 1957 11 29.4 27.3 2.1 78 20 1971 2016 2000 2001 top-third 2017 12 27.8 26.0 1.8 76 22 1956 2016 2000 2001 top-third 2022 18 32.4 31.5 0.9 62 36 1956,1971 2016,2019 2000 2001 normal 1929,1991 24 28.5 25.9 2.6 87 10 1972 2019 2001 2002 top-tenth 36 27.7 25.9 1.8 79 17 1973 2016 2001 1995 top-third 2022 48 27.1 25.9 1.2 69 26 1974 2019 2000 2001 top-third 1941,1990 60 27.4 25.9 1.5 77 17 1975 2019 2001 1981 top-third 1942