1925-2000 Degrees Fahrenheit 1 10.3 2.2 8.1 84 16 2012 1981 1976 1978 top-third 2 10.3 3.0 7.3 84 15 1934 2001 1978 1977 top-third 3 12.5 5.9 6.6 90 9 1943 2001 1978 1977 top-tenth 4 15.4 10.8 4.6 83 16 1934 2003 1978 1977 top-third 5 20.8 16.7 4.1 86 13 1934 2003 1978 1977 top-third 1945 6 26.0 22.2 3.8 87 12 1934 2003 1978 1977 top-third 7 29.9 26.6 3.3 85 14 1934 2003 1978 1977 top-third 8 32.1 29.4 2.7 82 17 1934 2003 1978 1977 top-third 1945,2008,2017 9 32.9 30.3 2.6 83 16 1934 2003 1978 1977 top-third 1927,1937,2008 10 32.3 29.6 2.7 84 15 1956 2018 1978 1927 top-third 11 30.6 27.9 2.7 85 14 1956 2016 1978 1927 top-third 12 28.9 26.0 2.9 86 13 1956 2020 1978 1927 top-third 2021 18 27.0 24.7 2.3 84 14 1957,1972 2020 1978 1945 top-third 1994 24 27.7 26.0 1.7 79 19 1957 2017 1978 1945 top-third 1980,2007,2023 36 27.6 25.9 1.7 79 18 1957 2017,2018 1978 1979 top-third 48 26.5 25.9 0.6 48 48 1975 2020 1978 1961 normal 1987,1992,2000 60 25.9 25.9 0.0 34 61 1976 2020 1978 1963 normal 1932,1961,1962,1963