1991-2020 Degrees Fahrenheit 1 76.7 76.2 0.5 70 45 1915 1934 2018 2019 normal 2 76.0 73.5 2.5 103 11 1915 2012 2019 2016 top-tenth 2016 3 70.5 68.8 1.7 101 12 1915 1934 2019 2018 top-third 1940,2001 4 65.0 63.9 1.1 92 20 1915 1934 2019 2016 top-third 2016 5 60.8 59.4 1.4 102 10 1915 2012 2019 2016 top-tenth 2001 6 56.1 55.0 1.1 97 14 1915 2012 2019 2017 top-third 1938,1974,2015 7 52.8 51.4 1.4 102 8 1915 2012 2019 2017 top-tenth 1954 8 50.7 48.8 1.9 103 6 1915 1934,2012 2019 2016 top-tenth 9 49.3 47.8 1.5 103 6 1915 1934 2019 2017 top-tenth 2017 10 48.9 48.2 0.7 92 17 1915 1934 2019 2018 top-third 2004,2018 11 50.9 49.8 1.1 93 14 1915,1917,1924,1993 1934 2019 2017 top-third 2005 12 52.8 51.8 1.0 92 15 1993 1934 2019 2017 top-third 1939 18 52.6 52.8 -0.2 73 34 1924 1934,2016 2019 2018 top-third 1926,1953,2008,2011 24 51.6 51.7 -0.1 72 33 1916,1917 2017 2019 2018 top-third 1941 36 51.8 51.7 0.1 76 27 1917 2017 2015 2019 top-third 48 52.2 51.7 0.5 88 13 1918 2018 2016 2019 top-third 1937,1941,2007,2014,2016 60 52.6 51.7 0.9 94 5 1930 2006 2019 2018 top-tenth