1925-2000 Degrees Fahrenheit 1 3.5 2.2 1.3 51 49 2012 1981 1943 1942 normal 2 6.1 3.0 3.1 66 33 1934 2001 1943 1942 top-third 3 10.4 5.9 4.5 77 22 1943 2001 1943 1930 top-third 1930 4 15.2 10.8 4.4 82 17 1934 2003 1943 1929 top-third 1987 5 20.2 16.7 3.5 81 18 1934 2003 1943 1930 top-third 6 24.9 22.2 2.7 77 22 1934 2003 1943 1937 top-third 2017 7 28.8 26.6 2.2 76 23 1934 2003 1943 1937 top-third 1985 8 31.6 29.4 2.2 76 23 1934 2003 1943 1937 top-third 9 32.5 30.3 2.2 78 21 1934 2003 1943 1937 top-third 10 31.6 29.6 2.0 78 21 1956 2018 1943 1941 top-third 1945,1998 11 29.8 27.9 1.9 78 21 1956 2016 1943 1941 top-third 1937 12 28.1 26.0 2.1 77 22 1956 2020 1943 1941 top-third 1999 18 24.9 24.7 0.2 39 59 1957,1972 2020 1935 1943 normal 1932,2012 24 26.8 26.0 0.8 62 36 1957 2017 1943 1943 normal 1943 36 27.2 25.9 1.3 71 26 1957 2017,2018 1941 1943 top-third 1946,1999 48 27.5 25.9 1.6 78 18 1975 2020 1943 1944 top-third 1945 60 27.1 25.9 1.2 72 23 1976 2020 1943 1944 top-third 1994,1996,2001