1901-2000 Degrees Fahrenheit 1 64.8 60.8 4.0 122 7 1912 2022 2011 2009 top-tenth 2018 2 69.1 65.2 3.9 126 3 1900 2020 2011 2001 top-tenth 2001 3 70.4 67.2 3.2 123 6 1912 2022 2011 2003 top-tenth 4 69.3 66.3 3.0 122 7 1907 2021 2011 2003 top-tenth 2015 5 66.9 63.9 3.0 122 7 1907,1965 2021 2011 2007 top-tenth 1994,2007 6 64.0 60.8 3.2 125 4 1912 2021 2011 2012 top-tenth 7 60.8 57.6 3.2 123 6 1912 1934,2007,2021 2011 2007 top-tenth 8 57.4 54.5 2.9 122 7 1903 1934,2015 2011 2007 top-tenth 2000 9 54.7 51.6 3.1 122 7 1917 2015 2011 2003 top-tenth 2003,2020 10 52.2 49.4 2.8 119 9 1917 2015 2011 2003 top-tenth 1981 11 50.8 48.3 2.5 114 14 1917 2015 2011 2003 top-third 12 50.8 48.4 2.4 116 12 1917 2015 2011 2003 top-tenth 1992 18 54.0 52.6 1.4 106 22 1917 2015 2011 2009 top-third 1981,1997 24 49.9 48.4 1.5 109 18 1913 2016 2011 2007 top-third 1981 36 49.3 48.4 0.9 93 33 1917 2017 2011 2009 top-third 1960,1982,1989 48 49.5 48.4 1.1 104 21 1915 2018 2011 2009 top-third 1937,1990,1992,1999,2013 60 49.4 48.4 1.0 97 27 1917 2018 2011 2010 top-third 1997