1991-2020 Degrees Fahrenheit 1 62.9 64.5 -1.6 61 65 1911 1974 2016 2017 normal 2 66.8 67.1 -0.3 96 27 1910 2017 2010 2017 top-third 1966,1987,2001,2002 3 68.7 68.0 0.7 109 14 1895 2022 2016 2017 top-third 4 67.7 66.8 0.9 113 10 1954 2021 2016 2017 top-tenth 2013,2020 5 66.4 65.1 1.3 116 6 1899 2021 2016 2017 top-tenth 2022 6 64.1 62.9 1.2 114 8 1899 2021 2013 2017 top-tenth 7 61.5 60.7 0.8 109 11 1899 2015 2013 2017 top-tenth 8 59.2 58.7 0.5 106 14 1899 2015 2013 2017 top-third 1987,1998,2013 9 57.7 56.9 0.8 109 10 1916 2015 2017 2016 top-tenth 10 56.0 55.4 0.6 107 11 1899,1917 2015 2017 2016 top-tenth 1940,1941,1995,1998,2014 11 55.3 54.6 0.7 108 10 1917 2015 2017 2016 top-tenth 1940 12 55.2 54.6 0.6 108 10 1917 2015 2017 2016 top-tenth 1940,1998 18 58.2 57.4 0.8 109 5 1917 2015 2017 2016 top-tenth 1992 24 55.0 54.6 0.4 100 11 1917 2016 2014 2017 top-tenth 1992,1998,2003,2005,2019 36 55.5 54.6 0.9 102 4 1911 2016,2017 2014 2017 top-tenth 48 55.9 54.6 1.3 100 1 1912 2017,2018 2017 2017 highest 2017 60 55.7 54.6 1.1 95 1 1918,1919 2018,2019 2017 2018 highest 2019