1991-2020 Degrees Fahrenheit 1 67.7 69.2 -1.5 72 58 1931 2006 2007 2009 normal 2 63.1 65.8 -2.7 37 93 1915 2006 1998 2009 bottom-third 1930,1942,1944,1978,1997 3 58.3 62.6 -4.3 22 108 1958 2017 1987 2009 bottom-third 1924,1959 4 55.9 59.9 -4.0 26 104 1978 2017 1987 2009 bottom-third 5 54.2 58.6 -4.4 13 116 1915 2017 1979 2009 bottom-tenth 1931,1947,1958,1964,1979 6 55.2 58.9 -3.7 19 110 1912 2017 1987 2009 bottom-third 1903,1906,1926,1930 7 57.1 60.6 -3.5 21 108 1977 2017 1987 2009 bottom-third 1903,1969 8 59.7 63.0 -3.3 22 107 1977 2017 1979 2009 bottom-third 1906,1944,1978 9 62.8 65.4 -2.6 31 98 1977 2017 1987 2009 bottom-third 1896,1918,1940,1941,1949 10 65.3 67.4 -2.1 48 81 1977 2017 1993 2009 normal 1942,1961,1993 11 67.1 68.7 -1.6 73 56 1977 2017 2001 2009 normal 1923,1928,1939,1990 12 68.1 69.3 -1.2 85 44 1977 2017,2023 2003 2009 normal 1907,1938,1956,1971,1981,1985,1998 18 65.7 65.8 -0.1 108 20 1913 2017 2008 2009 top-third 24 69.3 69.3 0.0 111 17 1978 2017 2008 2009 top-third 36 69.3 69.3 0.0 108 19 1906 2018 2005 2009 top-third 2015 48 69.3 69.2 0.1 108 18 1915 2023 2007 2009 top-third 2001,2007 60 69.6 69.1 0.5 112 13 1977,1979 2020 2008 2009 top-third 2014