1991-2020 Degrees Fahrenheit 1 55.8 54.8 1.0 101 26 1949 2014 2013 2015 top-third 2 59.3 59.7 -0.4 78 47 1911 2014 2013 2015 normal 1936,1947,1951,1962 3 63.4 63.0 0.4 104 18 1912 2014 2013 2015 top-third 1997 4 64.8 64.7 0.1 104 18 1899 2014 2013 2015 top-third 1942 5 65.0 64.4 0.6 109 13 1899 2015 2013 2015 top-third 2004 6 64.3 63.4 0.9 110 11 1899 2015 2013 2015 top-tenth 7 63.2 61.7 1.5 115 6 1899 2014,2015 2013 2015 top-tenth 8 61.5 60.0 1.5 114 5 1899 2015 2013 2015 top-tenth 9 60.1 58.3 1.8 115 4 1899 2015 2013 2015 top-tenth 1958 10 58.5 56.7 1.8 115 3 1899,1916 2015 2014 2015 top-tenth 1958 11 57.2 55.4 1.8 113 4 1899 2015 2014 2015 top-tenth 12 56.2 54.6 1.6 114 3 1899 2015 2014 2015 top-tenth 1958 18 59.6 57.5 2.1 111 2 1917 2015 2014 2015 top-tenth 24 56.7 54.6 2.1 109 1 1917 2016 2015 2016 highest 36 56.3 54.6 1.7 104 1 1911 2016 2015 2016 highest 48 55.9 54.6 1.3 99 1 1912 2016,2017,2018 2015 2016 highest 2017,2018 60 55.4 54.6 0.8 91 4 1919 2018 2015 2016 top-tenth