1901-2000 Degrees Fahrenheit 1 39.5 39.9 -0.4 52 77 1926 1921 1895 1895 normal 1900,1929,2015 2 30.9 33.6 -2.7 23 106 1926 1945 1895 1895 bottom-third 1904,1914,2015 3 24.5 27.9 -3.4 17 112 1926 2012 1895 1895 bottom-third 1972 4 22.1 24.7 -2.6 18 111 1923 2012 1895 1895 bottom-third 1917,1970,1971 5 -99 23.8 -99 -99 -99 1918 2012 normal 6 -99 25.4 -99 -99 -99 1918 2012 normal 7 -99 28.2 -99 -99 -99 1918 2012 normal 8 -99 31.7 -99 -99 -99 1918 2012 normal 9 -99 35.2 -99 -99 -99 1905 2012 normal 10 -99 38.3 -99 -99 -99 1905 2012 normal 11 -99 40.4 -99 -99 -99 1905 2012 normal 12 -99 41.4 -99 -99 -99 1918 2012 normal 18 -99 36.0 -99 -99 -99 1905 2013,2017 normal 24 -99 41.3 -99 -99 -99 1905 2013 normal 36 -99 41.3 -99 -99 -99 1906 2013 normal 48 -99 41.3 -99 -99 -99 1907 2013 normal 60 -99 41.3 -99 -99 -99 1908 2013 normal