1901-2000 Degrees Fahrenheit 1 21.3 20.2 1.1 57 72 1989 2015 1970 1971 normal 1991,2005 2 25.8 26.7 -0.9 36 93 1917 2015 1970 1971 bottom-third 1900,1905,1970 3 30.7 32.9 -2.2 16 113 1917 2015 1958 1971 bottom-third 1921 4 37.0 38.7 -1.7 16 113 1917 2015 1962 1971 bottom-third 1906 5 42.0 43.6 -1.6 15 114 1904 2015 1962 1971 bottom-third 6 46.0 47.3 -1.3 15 114 1904 2015 1962 1971 bottom-third 1919 7 48.1 49.3 -1.2 15 114 1904 2015 1962 1971 bottom-third 1907,1924 8 48.7 49.7 -1.0 18 111 1917 2015 1962 1971 bottom-third 1914 9 47.1 48.6 -1.5 9 120 1917 2015 1958 1971 bottom-tenth 1943 10 44.9 46.4 -1.5 8 121 1926 2012 1956 1971 bottom-tenth 11 42.1 43.7 -1.6 8 121 1917 2012 1958 1971 bottom-tenth 1940,1958 12 40.1 41.3 -1.2 13 116 1904 2012 1962 1971 bottom-tenth 1962 18 42.9 43.3 -0.4 30 98 1904 2012 1965 1971 bottom-third 1897,1908,1916,1958,1993 24 40.5 41.3 -0.8 18 110 1905 2012 1963 1971 bottom-third 1923 36 40.7 41.3 -0.6 20 107 1905,1906 2012 1964 1971 bottom-third 1903,1935,1964 48 40.9 41.3 -0.4 25 101 1907 2013 1968 1971 bottom-third 1902,1915 60 40.9 41.3 -0.4 25 100 1907 2012,2013 1967 1971 bottom-third 1903,1924,1925,1965,1967