1991-2020 Degrees Fahrenheit 1 32.6 33.2 -0.6 48 36 1977 2023 2009 2008 normal 2 34.2 35.8 -1.6 41 43 1977 2016 2009 2008 normal 3 39.5 39.5 0.0 57 26 1977 2016 2009 2007 top-third 1993 4 43.6 44.0 -0.4 53 30 1977 2016 2009 2008 normal 1952,1985 5 48.4 49.1 -0.7 53 30 1977 2016 2009 2008 normal 6 53.2 53.6 -0.4 59 24 1977 2016 2009 2008 top-third 1975,1995 7 56.4 57.2 -0.8 56 27 1977 2016 2009 2008 top-third 1947,1983,1992,1998 8 58.1 59.1 -1.0 50 32 1977 2016 2005 2009 normal 1975,1976,1979,2003,2005 9 58.8 59.6 -0.8 52 30 1977 2016 2009 2008 normal 1953 10 58.4 59.1 -0.7 56 26 1977 2016 2009 2009 top-third 1953,1991,2009,2014 11 57.0 57.6 -0.6 54 27 1977 2016 2004 2009 top-third 1947,1954 12 55.3 55.8 -0.5 55 26 1968 2013,2017 2004 2009 top-third 1972,1995 18 54.2 55.0 -0.8 50 30 1945,1964,1978 2017 2004 2009 normal 1955 24 55.4 55.7 -0.3 57 21 1969 2013 2005 2009 top-third 1950 36 55.5 55.7 -0.2 56 19 1970 2022,2023 2006 2009 top-third 2002 48 55.9 55.6 0.3 57 15 1964,1970,1971 2023 2007 2009 top-third 2002 60 56.0 55.6 0.4 56 13 1970 2023 2009 2009 top-third 2009,2011