1901-2000 Degrees Fahrenheit 1 26.6 34.6 -8.0 7 123 1960 2012 1965 1968 bottom-tenth 2 25.0 28.7 -3.7 28 102 1899 2012 1965 1968 bottom-third 1993 3 21.3 25.0 -3.7 19 111 1912 2012 1965 1968 bottom-third 4 21.1 24.5 -3.4 15 114 1979 2012 1965 1968 bottom-third 1918 5 23.8 26.7 -2.9 14 115 1912 2012 1965 1968 bottom-third 1956 6 28.6 30.9 -2.3 21 108 1912 2012 1965 1968 bottom-third 1897,2019 7 33.3 35.4 -2.1 19 110 1912 2012 1965 1968 bottom-third 1982 8 38.1 39.9 -1.8 22 107 1912 2012 1965 1968 bottom-third 9 41.9 43.7 -1.8 20 109 1899,1912 2012 1965 1968 bottom-third 1952,1986,2010 10 44.8 46.3 -1.5 27 102 1899,1904 2012 1965 1968 bottom-third 1997 11 45.8 47.5 -1.7 18 111 1899 2012 1962 1968 bottom-third 1917,1982,1997 12 46.2 47.5 -1.3 20 109 1899,1936 2012 1962 1968 bottom-third 1977 18 41.4 42.0 -0.6 39 89 1979 2017 1966 1968 bottom-third 1927,1972 24 46.5 47.5 -1.0 24 104 1905,1952 2017 1963 1968 bottom-third 1962,1971 36 46.6 47.5 -0.9 15 112 1918 2018 1962 1968 bottom-third 1904,1919,1960 48 47.0 47.5 -0.5 26 100 1906 1935,2002 1968 1968 bottom-third 1930,1961,1968,1973,1981 60 46.9 47.5 -0.6 22 103 1997 1935 1963 1968 bottom-third 1913,1982,1998