1925-2000 Degrees Fahrenheit 1 44.6 40.6 4.0 96 3 1992 1995 1996 1995 top-tenth 2 48.4 45.1 3.3 97 2 1992 1977 1996 1977 top-tenth 2007 3 50.7 47.6 3.1 97 2 1948 2019 1996 1997 top-tenth 2007 4 51.1 48.0 3.1 96 3 1948 2019 1996 1997 top-tenth 5 49.1 46.0 3.1 94 5 1948 2019 1996 1997 top-tenth 6 45.5 42.2 3.3 95 4 1985 2016 1996 1997 top-tenth 7 40.1 37.7 2.4 87 12 1971,1972 2019 1996 1993 top-third 1957,2020,2022 8 37.0 33.6 3.4 93 6 1972 2019 1996 1993 top-tenth 2015,2018 9 32.8 30.1 2.7 83 16 1971 2016 1996 1993 top-third 1998 10 29.6 27.5 2.1 78 20 1971 2016 1996 1993 top-third 2010 11 28.0 26.0 2.0 79 19 1971 2016 1996 1994 top-third 1929,1944 12 27.1 26.0 1.1 64 34 1971 2019 1996 1994 normal 1945,1963,2011 18 32.1 31.4 0.7 57 41 1956,1971 2016 1992 1996 normal 1927,1937,1945,2002 24 26.6 26.0 0.6 57 40 1972 2019 1996 1995 normal 36 26.7 25.9 0.8 57 39 1973 2016 1993 1996 normal 1931,2010,2012 48 27.1 25.9 1.2 68 27 1974 2019 1994 1996 top-third 1929,1988,1998 60 27.3 25.9 1.4 75 19 1975 2019 1996 1982 top-third 1998