1901-2000 Degrees Fahrenheit 1 24.0 23.3 0.7 70 59 1989 2015 1895 1895 normal 1921 2 27.6 28.9 -1.3 35 94 1976 2015 1895 1895 bottom-third 1921 3 31.9 35.1 -3.2 9 120 1976 2015 1895 1895 bottom-tenth 4 39.3 41.0 -1.7 21 108 1917 2015 1895 1895 bottom-third 1901,1933 5 44.5 45.9 -1.4 17 112 1917 2015 1895 1895 bottom-third 1933,1943 6 48.0 49.6 -1.6 14 115 1917 1931 1895 1895 bottom-third 1992 7 50.6 51.6 -1.0 23 106 1917 1931 1895 1895 bottom-third 1927,1967 8 51.2 51.8 -0.6 28 101 1917 2015,2021 1895 1895 bottom-third 1896,1898,1943 9 50.3 50.7 -0.4 36 93 1917 1998,2021 1895 1895 bottom-third 1919,1932,1937 10 47.6 48.6 -1.0 25 104 1917 2012 1895 1895 bottom-third 1932,1935 11 44.3 45.9 -1.6 11 118 1917 2012 1895 1895 bottom-tenth 1929 12 41.7 43.6 -1.9 8 121 1917 2012 1895 1895 bottom-tenth 1972 18 -99 45.6 -99 -99 -99 1904 2012 normal 24 -99 43.6 -99 -99 -99 1917 1999 normal 36 -99 43.5 -99 -99 -99 1918 2012 normal 48 -99 43.5 -99 -99 -99 1907,1917,1918,1926 2001 normal 60 -99 43.5 -99 -99 -99 1907 2002 normal