1991-2020 Degrees Fahrenheit 1 38.3 38.3 0.0 50 35 1960 2012 2008 2010 normal 2 31.9 33.4 -1.5 43 42 1978 2012 2008 2010 normal 2019 3 28.1 30.7 -2.6 27 58 1978 2012 2003 2010 bottom-third 1943 4 27.0 30.7 -3.7 19 66 1978 2012 1996 2010 bottom-third 5 29.8 32.8 -3.0 21 63 1978 2012 2001 2010 bottom-third 1943,1956 6 34.1 36.2 -2.1 28 55 1978 2012 2001 2010 normal 7 38.6 40.3 -1.7 30 53 1977,1978 2012,2016 2001 2010 normal 1952,1981 8 43.1 44.2 -1.1 36 47 1977 2012,2017 2001 2010 normal 1947,1948 9 46.9 47.4 -0.5 49 33 1977 2012 2010 2008 normal 1945,1955,1956,1972,1989,2004 10 49.6 49.7 -0.1 56 26 1977 2012 2010 2008 top-third 1972,2019 11 50.9 50.8 0.1 62 20 1977 2012 2010 2008 top-third 1945,1949,1953,1995 12 51.4 50.7 0.7 68 14 1977 2012 2010 2006 top-third 1954 18 46.3 45.9 0.4 65 15 1978 2017 2010 2007 top-third 2020 24 50.7 50.7 0.0 61 19 1978 2017 2010 2008 top-third 2001,2016,2019 36 50.4 50.7 -0.3 56 22 1979 2018 2010 2010 top-third 1988,2010 48 50.6 50.6 0.0 57 19 1980 2019 2010 2009 top-third 60 50.6 50.6 0.0 58 16 1981 2020 2001 2010 top-third 1957,1992,2015