1925-2000 Degrees Fahrenheit 1 44.0 40.6 3.4 90 9 1992 1995 1941 1929 top-tenth 2 47.2 45.1 2.1 86 13 1992 1977 1941 1926 top-third 2010,2014 3 48.9 47.6 1.3 79 20 1948 2019 1941 1926 top-third 1993,2009 4 49.2 48.0 1.2 77 22 1948 2019 1941 1936 top-third 5 47.6 46.0 1.6 83 16 1948 2019 1941 1926 top-third 1957,1979,1989 6 44.1 42.2 1.9 81 18 1985 2016 1941 1940 top-third 2014 7 39.1 37.7 1.4 74 25 1971,1972 2019 1941 1940 top-third 1967,2010 8 36.4 33.6 2.8 87 12 1972 2019 1941 1926 top-third 9 33.6 30.1 3.5 90 9 1971 2016 1941 1926 top-tenth 10 30.7 27.5 3.2 87 11 1971 2016 1941 1940 top-third 11 28.7 26.0 2.7 85 13 1971 2016 1941 1926 top-third 2004 12 28.4 26.0 2.4 85 13 1971 2019 1941 1926 top-third 18 33.3 31.4 1.9 81 17 1956,1971 2016 1940 1941 top-third 24 28.2 26.0 2.2 86 11 1972 2019 1941 1942 top-third 2002,2006 36 28.1 25.9 2.2 84 12 1973 2016 1941 1942 top-third 48 27.7 25.9 1.8 79 16 1974 2019 1941 1942 top-third 60 27.5 25.9 1.6 78 16 1975 2019 1941 1942 top-third