1991-2020 Degrees Fahrenheit 1 44.6 36.9 7.7 129 1 1924 2012 2011 2012 highest 2 35.0 33.1 1.9 116 14 1899 2017 2011 2007 top-third 1916 3 34.2 31.7 2.5 123 7 1899 2015 2011 1999 top-tenth 4 32.1 30.8 1.3 112 17 1899 1934 2011 2005 top-third 5 32.7 31.8 0.9 110 18 1899 2000 2011 2009 top-third 6 35.1 34.2 0.9 112 16 1899 1934 2011 2009 top-third 1966,2009 7 38.5 37.8 0.7 110 18 1899 1934 2011 2006 top-third 8 42.5 41.6 0.9 118 10 1899 2017 2011 2004 top-tenth 1935,1995,2018 9 45.7 44.7 1.0 117 11 1899 2017 2011 2004 top-tenth 1935,1967 10 47.3 46.5 0.8 115 13 1899 2017 2011 2004 top-tenth 11 47.3 47.0 0.3 107 21 1899 2017 2011 2007 top-third 2007 12 46.8 46.6 0.2 106 22 1899 2017 2011 2007 top-third 1982 18 42.6 42.5 0.1 107 19 1913 1935,2017 2011 2007 top-third 2003,2021 24 46.6 46.6 0.0 106 20 1913 2017 2011 2008 top-third 2020 36 45.7 46.6 -0.9 89 35 1914 2017,2018 2011 2010 top-third 1968,2010 48 45.9 46.6 -0.7 95 27 1915 2018 2011 2010 top-third 1993 60 46.0 46.6 -0.6 96 24 1917 2019 2000 2011 top-third 1935,1992,2000