1991-2020 Degrees Fahrenheit 1 45.4 45.1 0.3 46 37 2018 2010 2008 2006 normal 1964 2 38.1 38.6 -0.5 51 32 1950 2012 2008 2007 normal 1957,1976 3 32.4 32.6 -0.2 51 32 2014 2012 2008 2006 normal 4 26.2 28.6 -2.4 37 45 2014 2012 2008 2007 normal 1988,1993 5 23.6 27.4 -3.8 17 65 2014 2012 1996 2008 bottom-third 6 25.4 28.6 -3.2 20 60 2014 2012 1996 2008 bottom-third 7 28.8 31.4 -2.6 23 57 2014 2012 1996 2008 bottom-third 1986 8 33.0 35.2 -2.2 29 51 2014 2016 1996 2008 normal 9 37.0 39.0 -2.0 27 53 1943,1965,2014 2016 1996 2008 normal 1966,2015,2018 10 40.5 42.2 -1.7 31 49 1951 2012 1997 2008 normal 1944,1946,1960,1989,1997 11 42.9 44.5 -1.6 30 50 1943,1951 2012 1997 2008 normal 1955,1957,1973,1980,2018 12 43.8 45.6 -1.8 29 51 1943 2012 1997 2008 normal 1957,1997 18 37.7 39.9 -2.2 22 55 1952 2017 1997 2008 bottom-third 1993 24 44.5 45.6 -1.1 42 35 1952 2017 1997 2008 normal 1945,1981,2019 36 45.1 45.6 -0.5 52 23 1953,1979 2000 1998 2008 top-third 1985,2011 48 45.8 45.6 0.2 57 16 1980 2002 2004 2008 top-third 2004,2020 60 45.8 45.6 0.2 53 18 1972 2002 2005 2008 top-third 2005,2014