1901-2000 Degrees Fahrenheit 1 25.8 25.9 -0.1 67 63 1923 2010 2005 2006 normal 1914 2 18.7 20.5 -1.8 38 92 1923 2010 2003 2006 bottom-third 3 18.2 18.0 0.2 62 68 1923 2010 2004 2006 normal 4 20.6 18.2 2.4 99 30 1923 2016 2005 2006 top-third 2011 5 24.3 21.0 3.3 109 20 1934 2010 2005 2006 top-third 1995 6 27.7 24.9 2.8 106 23 1918 2012,2023 2005 2006 top-third 1953 7 31.8 29.2 2.6 110 19 1918 2012 2005 2006 top-third 1953,1991 8 35.5 33.4 2.1 104 25 1905 2016 2005 2006 top-third 9 39.2 36.9 2.3 108 21 1905 2023 2005 2006 top-third 1958,1995 10 41.6 39.2 2.4 113 16 1905 2023 2005 2006 top-third 1954,1991,1995,2011 11 42.7 40.3 2.4 116 13 1918 2023 2005 2006 top-tenth 2011 12 42.7 40.1 2.6 116 13 1918 2023 2005 2006 top-tenth 2017 18 38.1 35.0 3.1 119 9 1905 2013 2006 2000 top-tenth 24 42.8 40.1 2.7 120 8 1905 2023 2006 2000 top-tenth 36 42.1 40.1 2.0 114 13 1906 2023 2006 2002 top-tenth 2021 48 41.9 40.0 1.9 108 18 1907 2013,2023 2006 2002 top-third 2008,2017 60 41.5 40.0 1.5 101 24 1908 2013 2005 2006 top-third 1953,1999