1991-2020 Degrees Fahrenheit 1 52.4 47.8 4.6 94 14 1917 1963 2010 2007 top-third 2 55.6 54.4 1.2 82 25 1917 1931 2010 2007 top-third 1941,1958,2013 3 59.9 58.9 1.0 77 29 1917 1947 2009 2010 top-third 4 63.6 61.8 1.8 90 16 1992 1947 2009 2010 top-third 1937,1973,1983,2012 5 64.3 62.9 1.4 84 22 1992 1931 2009 2010 top-third 6 63.1 62.0 1.1 81 25 1917 1931 2009 2010 top-third 1944 7 60.5 59.6 0.9 83 23 1917 1955 2009 2010 top-third 1987 8 56.6 56.0 0.6 75 31 1917 2012 2009 2010 top-third 1930 9 52.3 51.9 0.4 78 28 1917 2012 2009 2010 top-third 1910,1976 10 48.1 48.1 0.0 64 41 1917 2012 2009 2010 normal 1942,1995,2004 11 45.0 45.6 -0.6 48 57 1917 2012 2009 2010 normal 1958,1963 12 44.2 44.6 -0.4 57 48 1917 2012 2009 2010 normal 1940 18 50.6 50.4 0.2 70 33 1917 2012 2010 2010 top-third 1933,1991,2010 24 45.2 44.6 0.6 83 19 1918 2017 2010 2007 top-third 1934 36 44.3 44.6 -0.3 67 33 1952 2012 2010 2008 top-third 1939,1956,1991,1992 48 44.0 44.6 -0.6 53 45 1918 1934,2013 1999 2010 normal 1950,1976 60 44.5 44.6 -0.1 70 26 1969,1997 1934 2001 2010 top-third 1941,2001