1901-2000 Degrees Fahrenheit 1 63.9 65.3 -1.4 30 99 1993 2007 2009 2014 bottom-third 2 63.5 61.5 2.0 106 23 1915 2021 2014 2013 top-third 3 58.0 57.1 0.9 88 41 1915 1936 2014 2013 top-third 1926,1996 4 53.8 52.5 1.3 96 33 1950 1988 2014 2012 top-third 1925,1926,1952,1956,1980 5 50.6 47.9 2.7 115 14 1917 2012 2014 2012 top-third 1992 6 46.9 43.6 3.3 121 8 1899,1917 1934 2014 2012 top-tenth 7 43.8 40.0 3.8 124 5 1917 1934 2014 2012 top-tenth 8 41.5 37.6 3.9 124 4 1917 1934 2014 2012 top-tenth 2000 9 39.9 36.6 3.3 123 5 1917 1934 2014 2012 top-tenth 2006 10 40.6 37.2 3.4 122 6 1917 1934 2014 2012 top-tenth 11 42.0 38.7 3.3 122 6 1917 1934 2014 2012 top-tenth 12 43.7 40.8 2.9 123 5 1917 1934 2014 2012 top-tenth 1981 18 43.8 41.7 2.1 116 12 1917 2016 2014 2013 top-tenth 1988 24 42.7 40.7 2.0 115 12 1913,1917 2016 2014 2013 top-tenth 1941,2005 36 42.6 40.7 1.9 115 11 1917 2017 2012 2014 top-tenth 1936,2005,2022 48 43.1 40.7 2.4 122 3 1899 2018 2014 2015 top-tenth 60 42.7 40.7 2.0 117 7 1917 2016 2014 2007 top-tenth 2003,2004