1901-2000 Degrees Fahrenheit 1 67.6 66.0 1.6 91 38 1903 2016 2008 2010 top-third 1901 2 69.5 67.1 2.4 113 16 1903 1955 2009 2010 top-third 1947,1973,2002 3 68.0 65.9 2.1 115 14 1903 2005 2009 2010 top-third 1900,1937 4 65.5 63.0 2.5 121 8 1927 1955,2018 2009 2010 top-tenth 1911,2022 5 61.4 59.0 2.4 122 7 1907 1955,2010 2009 2010 top-tenth 2005 6 56.3 54.3 2.0 115 14 1926 2012 2009 2010 top-third 1942 7 51.4 49.5 1.9 111 18 1926 2012 2009 2010 top-third 2006 8 47.3 45.8 1.5 101 28 1912 2012 2009 2010 top-third 9 44.6 43.4 1.2 91 37 1904 2012 2009 2010 top-third 1975 10 43.9 42.7 1.2 92 36 1904 2012 2009 2010 top-third 1937,1975 11 44.4 43.2 1.2 96 32 1926 2012 2009 2010 top-third 12 45.7 44.5 1.2 97 31 1918 2012 2009 2010 top-third 18 50.0 47.8 2.2 117 11 1918 2012 2010 2006 top-tenth 24 46.5 44.5 2.0 114 13 1905 2017 2010 2007 top-tenth 1991,2016 36 46.0 44.5 1.5 106 20 1906 2012 2009 2010 top-third 48 46.1 44.5 1.6 111 14 1907 2013 2009 2010 top-third 2007,2009 60 46.1 44.5 1.6 111 13 1908 2020 2009 2010 top-third 2001,2003,2009,2017,2018