1991-2020 Degrees Fahrenheit 1 46.5 42.7 3.8 106 24 1975 1915 2015 2012 top-third 2 43.1 38.6 4.5 122 8 2002 1910 2014 2015 top-tenth 1915 3 41.4 34.6 6.8 129 1 2019 2016 2015 2016 highest 4 37.9 32.3 5.6 126 4 1936,1969 1992 2015 1992 top-tenth 5 35.7 31.0 4.7 124 5 1969 1992 2015 1992 top-tenth 6 35.0 31.5 3.5 121 8 1979 1992 2015 2012 top-tenth 7 37.0 33.5 3.5 123 5 1899 1987 2015 2012 top-tenth 8 39.6 36.5 3.1 124 4 1899 2012 2015 2012 top-tenth 2000 9 42.8 39.9 2.9 124 4 1899 1992,2012 2015 2012 top-tenth 2000 10 45.2 42.7 2.5 124 4 1899 1992,2012 2015 2012 top-tenth 1934 11 47.1 44.3 2.8 126 2 1899 1934 2015 1934 top-tenth 12 47.4 44.9 2.5 125 3 1917,1969 1934 2015 1987 top-tenth 1987 18 42.7 40.4 2.3 124 3 1979 1988 2015 2013 top-tenth 24 46.9 44.9 2.0 125 1 1917,1979 1988,2013,2016 2015 2013 highest 1988,2013 36 45.9 44.9 1.0 116 8 1952 2000 2015 2014 top-tenth 48 46.1 45.0 1.1 120 2 1952 1934 2015 2015 top-tenth 2015 60 46.3 45.0 1.3 119 1 1952 2016 2015 2016 highest