1901-2000 Degrees Fahrenheit 1 7.3 9.8 -2.5 50 80 1936 1998 1910 1908 normal 2 2.0 7.0 -5.0 19 111 1936 1987 1907 1910 bottom-third 3 4.3 8.3 -4.0 22 107 1936 1998 1907 1910 bottom-third 4 8.5 12.7 -4.2 15 114 1936 2002 1907 1910 bottom-third 5 16.2 18.8 -2.6 21 108 1936 2012 1907 1910 bottom-third 6 22.6 24.9 -2.3 23 106 1936 2016 1904 1910 bottom-third 7 28.3 30.7 -2.4 15 114 1936 2012,2016 1904 1910 bottom-third 1937 8 33.3 35.4 -2.1 18 111 1936 2012 1904 1910 bottom-third 1903,1927,1929 9 37.0 38.4 -1.4 30 99 1936 2012,2016 1907 1910 bottom-third 1905 10 38.2 39.9 -1.7 24 105 1936 2002 1907 1910 bottom-third 11 38.9 39.9 -1.0 34 95 1936 2002,2016 1910 1909 bottom-third 1908,1948,1969,1972 12 38.9 38.5 0.4 69 60 1936 2016 1910 1902 normal 18 33.7 34.0 -0.3 49 79 1918 2017 1910 1909 normal 2020 24 37.9 38.5 -0.6 36 92 1918 2017 1910 1907 bottom-third 1907,1920,1946,1950 36 37.9 38.5 -0.6 34 93 1918 2018 1910 1903 bottom-third 1928,1971 48 37.8 38.4 -0.6 28 98 1900,1918,1920 2002 1910 1909 bottom-third 1904,1909,1915,1972,1973 60 37.6 38.4 -0.8 18 107 1920 2002 1910 1910 bottom-third 1905,1910,1914,1916,1951,1970