1901-2000 Degrees Fahrenheit 1 57.6 55.2 2.4 96 34 1907 1896 1963 1964 top-third 2 48.5 50.3 -1.8 32 98 1960 2012 1962 1964 bottom-third 3 44.1 45.7 -1.6 33 97 1958 2012 1960 1964 bottom-third 1928,1950 4 41.7 42.7 -1.0 39 91 1978 2017 1963 1964 bottom-third 2010 5 41.0 41.4 -0.4 50 79 1978 2012 1964 1957 normal 1981,2003,2011,2018 6 42.2 42.1 0.1 59 70 1978 2012 1964 1957 normal 2009 7 43.8 44.2 -0.4 46 83 1978 2017 1964 1957 normal 1924 8 46.8 47.3 -0.5 41 88 1977 2017 1964 1957 bottom-third 1906,2010 9 49.8 50.3 -0.5 36 93 1977 2017 1964 1957 bottom-third 2010 10 52.4 52.9 -0.5 34 95 1977 2017 1964 1957 bottom-third 1906,1984,1994 11 54.3 54.7 -0.4 39 90 1977 2017 1964 1957 bottom-third 1911,1947 12 55.3 55.5 -0.2 46 83 1977 2017 1964 1957 normal 1910,1917,1929 18 50.3 51.0 -0.7 26 102 1978 2017 1964 1958 bottom-third 2014 24 54.8 55.5 -0.7 22 106 1978 2017 1964 1958 bottom-third 1906,1983,1997 36 54.7 55.5 -0.8 19 108 1979 2018 1964 1959 bottom-third 48 54.6 55.5 -0.9 13 113 1980 2019 1964 1960 bottom-tenth 1918,1968 60 54.6 55.5 -0.9 13 112 1981 2020 1964 1961 bottom-third 1978,1983