1991-2020 Degrees Fahrenheit 1 58.5 59.7 -1.2 36 49 1988 2007 2003 2001 normal 2 64.9 65.2 -0.3 54 30 1981 2007 2003 2001 normal 1949 3 68.7 69.4 -0.7 48 36 1940 2016,2021 2000 2003 normal 4 70.7 71.9 -1.2 39 45 1940 2016 2000 2003 normal 5 71.1 72.1 -1.0 39 45 1940 2010 2003 2003 normal 1941,1966,1980,2003 6 70.3 70.8 -0.5 53 31 1940 2010 2003 2002 normal 1973,1994 7 68.0 68.3 -0.3 57 27 1940 2010 2003 2002 top-third 1941,1952 8 65.1 65.2 -0.1 60 24 1940 2010 2003 2002 top-third 2001 9 61.8 62.0 -0.2 62 22 1940 2010,2012 2003 2002 top-third 1990,1995,2008 10 58.3 59.2 -0.9 49 35 1940 2012 2003 2002 normal 1989,1997 11 56.6 57.5 -0.9 50 34 1940 2016 2003 2002 normal 1951,2011 12 56.2 56.8 -0.6 56 28 1940 2016 2003 2002 top-third 18 60.5 61.4 -0.9 55 28 1978 2016 2003 2002 normal 1952,1960,1971 24 55.3 56.8 -1.5 37 46 1978 2017 1997 2003 normal 1958,1960,1975,1994 36 56.5 56.7 -0.2 60 22 1979 2018 2003 2002 top-third 1992,2011,2016 48 56.4 56.7 -0.3 57 24 1943 2019 1998 2003 top-third 1998,2006,2015 60 56.4 56.7 -0.3 57 23 1944,1981,1982 2020 1998 2003 top-third 1955,2015