1901-2000 Degrees Fahrenheit 1 69.3 70.5 -1.2 35 94 1928 1934 1897 1896 bottom-third 2 63.3 65.9 -2.6 15 114 1917 2018 1897 1896 bottom-third 3 58.6 60.8 -2.2 13 116 1907 1991 1897 1896 bottom-tenth 1983 4 54.2 55.5 -1.3 26 103 1926 2012 1897 1896 bottom-third 1923,1966,1969 5 49.5 50.3 -0.8 41 88 1978 2012 1895 1896 bottom-third 1951,1969 6 45.2 46.3 -1.1 31 98 1978 2012 1895 1896 bottom-third 1899,1918,1968,1969,1972 7 43.5 44.0 -0.5 41 87 1978 2012 1897 1896 bottom-third 1923,1945,1966 8 43.4 43.7 -0.3 46 82 1904 2012 1897 1896 normal 1900,1923,1945,1959,1962 9 44.1 44.8 -0.7 34 94 1904,1978 2012 1897 1896 bottom-third 1915,1969,1971 10 45.9 46.9 -1.0 29 99 1904 2012 1897 1896 bottom-third 1997,2015 11 48.3 49.2 -0.9 26 102 1904 2012 1897 1896 bottom-third 1910,2015 12 50.5 51.3 -0.8 28 100 1904 2012 1897 1896 bottom-third 1916,1994 18 49.7 49.6 0.1 61 67 1979 2017 1896 1897 normal 1899,1937,1952,1989,2009 24 51.1 51.3 -0.2 47 80 1978 2017 1897 1897 normal 1910,1941 36 -99 51.3 -99 -99 -99 1979 2018 normal 48 -99 51.3 -99 -99 -99 1980 2019 normal 60 -99 51.3 -99 -99 -99 1981 2020 normal