1991-2020 Degrees Fahrenheit 1 41.5 39.6 1.9 113 11 1948 2017 2006 2001 top-tenth 2 47.2 46.4 0.8 104 20 1911,1919 2016 2006 2005 top-third 2010 3 54.0 53.3 0.7 107 17 1912 2016 2006 2005 top-third 4 60.1 59.1 1.0 117 7 1912,1916 2015 2006 2001 top-tenth 2017,2021 5 64.4 63.1 1.3 118 6 1912 2012 2006 2003 top-tenth 2003 6 66.1 64.7 1.4 118 6 1912 2012 2006 2001 top-tenth 2020 7 65.6 64.3 1.3 117 7 1912 2012 2006 2001 top-tenth 2017 8 64.0 62.8 1.2 118 6 1912 2012 2006 2001 top-tenth 2017 9 62.1 60.8 1.3 118 6 1912 2012 2006 2001 top-tenth 2021 10 59.6 58.2 1.4 119 5 1912,1917,1929 2012 2006 2001 top-tenth 2015 11 56.2 55.5 0.7 113 11 1917 2012 2006 2003 top-tenth 12 53.9 53.2 0.7 112 11 1917 2012 2006 2003 top-tenth 1996 18 57.2 57.0 0.2 109 14 1917 2017 2006 2003 top-third 1995,1996,2013 24 53.6 53.2 0.4 107 15 1917 2018 2006 2006 top-third 1996,2006 36 53.7 53.2 0.5 111 10 1917 2017 2006 2005 top-tenth 2021 48 53.4 53.1 0.3 106 14 1920 2018 2000 2006 top-third 60 53.7 53.1 0.6 110 9 1917,1920 2018,2019,2021 2006 2005 top-tenth 2016,2017