1901-2000 Degrees Fahrenheit 1 48.3 44.6 3.7 104 26 1940 1974 2011 2007 top-third 2 49.5 45.2 4.3 110 19 1918 1932 2011 2007 top-third 1907,2002 3 51.4 47.8 3.6 119 10 1918 1932 2011 2002 top-tenth 1950 4 53.8 51.7 2.1 105 24 1918 1932 2011 2008 top-third 1942,2007 5 57.9 56.1 1.8 103 26 1918 1932 2011 2008 top-third 1916,2013 6 61.8 59.9 1.9 111 18 1977 1932 2011 2008 top-third 7 64.8 62.7 2.1 118 11 1977 1932 2011 2008 top-tenth 2019,2021 8 66.8 64.5 2.3 123 6 1977 1932 2011 1999 top-tenth 1937 9 67.3 65.2 2.1 121 8 1977 1932 2011 1999 top-tenth 10 67.1 64.8 2.3 123 6 1977 2017 2011 1999 top-tenth 11 66.0 63.8 2.2 124 5 1918 2017 2011 1999 top-tenth 12 64.7 62.4 2.3 124 5 1918 2017 2011 1999 top-tenth 2013 18 62.9 61.6 1.3 108 20 1905 2017 2011 2009 top-third 2000,2016 24 63.7 62.4 1.3 113 15 1970 2017,2020 2011 2008 top-third 1947,1987,2008 36 63.2 62.4 0.8 106 21 1970 2019,2021 2011 2009 top-third 1928,1947,1951,1987 48 63.2 62.4 0.8 109 17 1970 2020 2011 2010 top-third 1950,1952,1992,1993,2005,2006,2007,2010 60 63.3 62.4 0.9 113 12 1970 2020,2021 2011 2009 top-tenth 1936,2008