1991-2020 Degrees Fahrenheit 1 77.8 76.2 1.6 91 24 1915 1934 1933 1937 top-third 2 74.6 73.5 1.1 90 24 1915 2012 1937 1936 top-third 1911,1925,2018 3 69.4 68.8 0.6 84 29 1915 1934 1935 1937 top-third 1925,1955,1980,1985,2005,2007,2013 4 64.4 63.9 0.5 74 38 1915 1934 1935 1937 normal 2005 5 60.5 59.4 1.1 95 17 1915 2012 1937 1936 top-third 2007 6 56.1 55.0 1.1 97 14 1915 2012 1937 1934 top-third 1974,2015,2020 7 52.6 51.4 1.2 99 11 1915 2012 1937 1934 top-tenth 1946,1999 8 49.6 48.8 0.8 90 19 1915 1934,2012 1937 1934 top-third 9 48.2 47.8 0.4 86 23 1915 1934 1937 1935 top-third 1946 10 48.7 48.2 0.5 88 21 1915 1934 1937 1935 top-third 1939,1986 11 50.5 49.8 0.7 90 17 1915,1917,1924,1993 1934 1937 1935 top-third 1935 12 52.9 51.8 1.1 95 12 1993 1934 1937 1934 top-third 1954,1963 18 53.3 52.8 0.5 86 21 1924 1934,2016 1937 1935 top-third 1981,2001,2004 24 51.7 51.7 0.0 74 31 1916,1917 2017 1937 1936 top-third 1982 36 51.4 51.7 -0.3 67 36 1917 2017 1937 1937 normal 1937,1957,1976,1977,1982,1988,1999 48 51.7 51.7 0.0 71 30 1918 2018 1933 1937 top-third 2009,2021 60 52.4 51.7 0.7 89 10 1930 2006 1937 1938 top-tenth