1991-2020 Degrees Fahrenheit 1 48.8 50.3 -1.5 50 46 1960 2012 2005 2008 normal 2 45.9 46.7 -0.8 58 38 1960 2012 2005 2008 normal 1957,1995 3 43.1 44.3 -1.2 51 44 1958 2023 2004 2008 normal 4 43.4 43.9 -0.5 65 30 1978 2012 2005 2008 top-third 1938,2005,2013 5 44.0 45.0 -1.0 61 34 1940 2012 2003 2008 normal 1985,2013 6 46.3 47.5 -1.2 58 36 1977 2012 2001 2008 normal 1942,1952 7 49.8 50.9 -1.1 58 36 1977 2017 2004 2008 normal 1952,2004 8 53.1 54.2 -1.1 54 40 1977 2017 2001 2008 normal 1954 9 55.9 56.9 -1.0 58 36 1977 2017 2004 2008 normal 1935,1952,1954,1986,1987,2004 10 58.2 58.8 -0.6 64 30 1977 2017 2004 2008 top-third 1942 11 58.9 59.6 -0.7 61 33 1977 2017 2004 2008 normal 1957 12 58.8 59.6 -0.8 61 33 1977 2017,2020 2004 2008 normal 1972 18 55.8 55.5 0.3 75 17 1964 2017 2005 2008 top-third 24 59.9 59.5 0.4 80 12 1978 2017 2007 2008 top-third 2006,2007 36 59.9 59.5 0.4 79 11 1964,1969,1970 2018 2007 2008 top-third 2007 48 59.9 59.5 0.4 78 10 1970 2019,2020 2007 2008 top-third 2012 60 59.9 59.5 0.4 78 8 1968,1970 2020 2008 2009 top-tenth 2017