1901-2000 Degrees Fahrenheit 1 42.2 45.3 -3.1 15 115 1903 2015 1897 1896 bottom-third 2 42.1 43.9 -1.8 19 111 1949 2015 1897 1896 bottom-third 1944 3 43.3 43.6 -0.3 41 88 1949 2015 1897 1896 bottom-third 1899,1904,1948 4 44.4 45.1 -0.7 33 96 1949 2015 1897 1896 bottom-third 5 47.5 48.0 -0.5 35 94 1949 2015 1897 1896 bottom-third 1899,1916,1942,1966,1974 6 50.7 51.4 -0.7 33 96 1917,1949 2015 1897 1896 bottom-third 1901 7 53.9 54.6 -0.7 31 98 1917 2015 1897 1896 bottom-third 1908,1923,1939,1948 8 56.6 57.1 -0.5 34 95 1917 2015 1896 1897 bottom-third 1904,1939,1950,1962,1983 9 58.2 58.3 -0.1 50 79 1917 2015 1896 1897 normal 1900,1946,1985 10 58.3 58.6 -0.3 44 85 1917 2015 1896 1897 normal 1904,1907,1939,1948,1950,1957,1962 11 57.4 58.1 -0.7 19 110 1949 2015 1897 1896 bottom-third 1901,1915,1919,1956,1973 12 56.8 57.4 -0.6 26 103 1949 2015 1897 1896 bottom-third 1916,1924,1946,1999 18 54.9 55.4 -0.5 27 101 1913,1949 2015 1897 1897 bottom-third 1900,1911,1926,1945 24 56.9 57.4 -0.5 26 102 1913 2015,2016 1897 1897 bottom-third 1912,1916,1919,1945,1947,1955,1957 36 -99 57.4 -99 -99 -99 1914 2016 normal 48 -99 57.4 -99 -99 -99 1913 2018 normal 60 -99 57.3 -99 -99 -99 1913 2018 normal