1991-2020 Degrees Fahrenheit 1 61.4 59.1 2.3 117 12 1917 2015 2009 2004 top-tenth 2 56.7 53.3 3.4 127 2 1907 1991 2009 1991 top-tenth 3 51.8 47.3 4.5 127 2 1926 2012 2009 2010 top-tenth 4 45.9 42.0 3.9 127 2 1926 2012 2009 2010 top-tenth 5 41.6 38.4 3.2 125 4 1904 2012 2009 1998 top-tenth 6 39.3 37.0 2.3 120 7 1904 2012 2009 2002 top-tenth 7 39.9 37.4 2.5 121 4 1904 2012 2009 2002 top-tenth 8 40.9 39.1 1.8 119 6 1905 2012 2009 2002 top-tenth 2020 9 43.1 41.8 1.3 116 9 1905 2012 2009 2006 top-tenth 10 45.9 44.7 1.2 116 9 1904 2012 2009 2006 top-tenth 11 47.9 47.2 0.7 114 11 1904 2012 2009 2006 top-tenth 2000,2019 12 49.5 48.9 0.6 113 12 1904 2012 2009 2008 top-tenth 1998,2008,2019 18 45.1 44.9 0.2 106 17 1905 2017 2009 2008 top-third 1992,1998 24 49.1 48.9 0.2 106 15 1905 2013 2009 2009 top-third 2009,2019 36 49.2 48.8 0.4 105 12 1906 2012,2013 2009 2008 top-tenth 2007 48 49.1 48.8 0.3 102 12 1906 2013 2007 2009 top-third 2002,2007,2011,2017 60 49.5 48.7 0.8 103 8 1906,1920,1927 2020 2009 2010 top-tenth 2019