1901-2000 Degrees Fahrenheit 1 38.4 38.8 -0.4 59 71 1920 1915 2008 2007 normal 1959,1993 2 34.6 34.0 0.6 73 57 1917 1910 2008 2007 normal 1914,1961,2011 3 32.0 30.1 1.9 98 32 1899 1992 2008 2007 top-third 4 29.9 27.2 2.7 109 21 1917 1992 2008 2007 top-third 2007 5 27.7 25.8 1.9 100 29 1917 1981 2008 2007 top-third 1961 6 28.9 26.4 2.5 111 18 1917 1934 2008 2007 top-third 7 30.9 28.7 2.2 112 17 1917 1934 2008 2006 top-third 1946,2018 8 33.7 31.8 1.9 111 18 1917 1934 2008 2006 top-third 9 37.1 35.3 1.8 112 17 1917 1934 2008 2006 top-third 1938,2018 10 40.1 38.3 1.8 110 19 1917 1934 2008 2007 top-third 1935,2002,2013 11 41.6 40.1 1.5 103 26 1917 1934 2008 2007 top-third 1990 12 42.0 40.8 1.2 97 32 1917 1934 2008 2008 top-third 1998,2008 18 36.6 36.0 0.6 80 48 1913 1935,2016 1997 2008 normal 1911,1939,1997,2011 24 42.0 40.7 1.3 99 29 1917 1935 2002 2008 top-third 2002 36 42.3 40.7 1.6 108 19 1918 2017 2003 2008 top-third 1992,2023 48 42.4 40.7 1.7 113 13 1899 2018 2004 2008 top-tenth 2000,2004 60 42.4 40.7 1.7 112 13 1917 2017 2005 2008 top-third 2005