1991-2020 Degrees Fahrenheit 1 82.4 84.7 -2.3 25 76 1950 2011 1924 1907 bottom-third 2 82.6 82.5 0.1 61 40 2007 2011 1907 1924 normal 3 77.3 78.9 -1.6 28 73 1976 2011 1907 1924 bottom-third 4 73.3 74.9 -1.6 23 78 1973 2011 1907 1924 bottom-third 5 67.6 70.9 -3.3 4 97 1931 2011 1924 1907 bottom-tenth 6 63.6 66.8 -3.2 6 94 1947,1958,1983 2011 1924 1924 bottom-tenth 1931,1968 7 59.6 63.3 -3.7 3 97 1979 2012 1924 1924 bottom-tenth 8 57.7 60.8 -3.1 4 96 1979 2012 1924 1924 bottom-tenth 1947 9 -99 59.9 -99 -99 -99 1973 2012 normal 10 -99 60.4 -99 -99 -99 1973 2012 normal 11 -99 61.8 -99 -99 -99 1973 2022 normal 12 -99 63.7 -99 -99 -99 1973 2012 normal 18 -99 64.7 -99 -99 -99 1983,1984 2012 normal 24 -99 63.7 -99 -99 -99 1994 2012 normal 36 -99 63.6 -99 -99 -99 1979 2013 normal 48 -99 63.6 -99 -99 -99 1985 2014,2018 normal 60 -99 63.6 -99 -99 -99 1979 2012 normal