1991-2020 Degrees Fahrenheit 1 30.4 35.8 -5.4 25 100 1960 2012 1900 1903 bottom-third 2 21.6 31.7 -10.1 2 123 1899 2012 1899 1903 bottom-tenth 3 20.2 30.0 -9.8 1 122 1904 2012 1904 1903 lowest 4 20.9 30.5 -9.6 1 122 1904 2012 1904 1903 lowest 5 24.0 32.6 -8.6 1 122 1904 2012 1904 1903 lowest 6 28.7 35.8 -7.1 1 122 1904 2012 1904 1903 lowest 7 33.4 39.7 -6.3 1 122 1904 2012 1904 1903 lowest 8 37.3 43.6 -6.3 1 122 1904 2012 1904 1903 lowest 9 40.9 46.7 -5.8 1 122 1904 2012 1904 1903 lowest 10 43.1 48.8 -5.7 2 121 1918 2012 1904 1903 bottom-tenth 11 44.7 49.6 -4.9 2 120 1918 2012 1904 1903 bottom-tenth 12 44.8 49.4 -4.6 2 119 1918 2012 1904 1903 bottom-tenth 18 41.7 44.8 -3.1 11 106 1918 2017 1900 1903 bottom-tenth 1899 24 46.5 49.4 -2.9 9 106 1918 2017 1899 1903 bottom-tenth 1899,1909,1917,1952,1978 36 47.0 49.4 -2.4 16 95 1918 2013 1900 1903 bottom-third 1982 48 47.3 49.4 -2.1 17 90 1918,1919 2002 1901 1903 bottom-third 1979 60 47.4 49.3 -1.9 13 91 1920 2002,2020 1902 1903 bottom-third 1902,1944,1952,1963,1970,1971,1979,1983