1991-2020 Degrees Fahrenheit 1 44.8 45.1 -0.3 53 55 2018 1915 2008 2010 normal 2 37.1 38.2 -1.1 54 54 1965 2012 2008 2010 normal 2023 3 30.5 31.7 -1.2 58 50 1965,2014 2012 2008 2010 normal 1948,1963,1974 4 25.6 27.4 -1.8 47 60 1979 2012 2008 2010 normal 5 23.3 26.0 -2.7 33 74 1979 2012 2008 2010 bottom-third 1929 6 25.2 27.2 -2.0 38 69 1979 2012 2008 2010 normal 7 29.0 30.2 -1.2 51 56 1979 2012 2009 2010 normal 8 32.8 34.0 -1.2 47 59 1979 2012 2001 2010 normal 1911,1916 9 37.2 37.8 -0.6 56 49 1979 2012 2009 2010 normal 1935,1940,2013 10 40.7 41.1 -0.4 56 49 1979 2012 2009 2010 normal 1910,1957 11 43.0 43.4 -0.4 58 47 1979 2012 2010 2010 normal 1910,2003,2008,2010 12 44.3 44.6 -0.3 59 46 1979 2012 2010 2008 normal 18 39.2 38.8 0.4 81 23 1918 2017 2010 2008 top-third 2008 24 44.3 44.6 -0.3 62 40 1918 2017 2010 2008 normal 1938,1977,1989 36 44.1 44.6 -0.5 59 40 1918 2017 1998 2010 normal 1946,1954,1976,1982,1983,2016 48 44.2 44.6 -0.4 59 38 1980 1934 1999 2010 normal 1983 60 44.4 44.6 -0.2 65 30 1997 1935 2001 2010 top-third 1944,1945,1958,2000,2001