1901-2000 Degrees Fahrenheit 1 28.5 24.1 4.4 107 23 1918 2023 2015 2012 top-third 1975 2 35.2 26.2 9.0 128 1 1918 2016 2015 2016 highest 3 38.3 30.5 7.8 128 1 1918 2016 2015 2016 highest 4 41.3 35.4 5.9 127 2 1918 2023 2015 2016 top-tenth 5 46.3 40.4 5.9 128 1 1918 2016 2015 2016 highest 6 50.4 44.9 5.5 128 1 1918 2016 2015 2016 highest 7 53.3 48.5 4.8 127 2 1918 2023 2015 2016 top-tenth 8 54.6 50.5 4.1 127 2 1904 2023 2015 2012 top-tenth 2012 9 55.4 51.0 4.4 127 2 1918 2023 2015 2016 top-tenth 10 54.4 50.4 4.0 127 2 1918 2023 2015 2016 top-tenth 11 52.1 48.9 3.2 122 7 1918 2023 2015 2013 top-tenth 12 49.0 46.9 2.1 111 18 1918 2023 2015 2013 top-third 1991,2018 18 48.1 46.2 1.9 108 20 1905 2013 2015 2014 top-third 2006 24 48.3 46.9 1.4 103 25 1918 2023 2015 2014 top-third 1951,1953,1955 36 48.4 46.9 1.5 105 22 1906,1919 2023 2010 2015 top-third 1955,1993,1999 48 49.0 46.9 2.1 114 12 1905,1908,1918 2023 2011 2015 top-tenth 60 49.3 46.9 2.4 117 8 1908 2023 2012 2015 top-tenth 2017