1991-2020 Degrees Fahrenheit 1 49.7 50.1 -0.4 46 39 1950 2010 1984 1987 normal 2 44.1 44.3 -0.2 49 36 1984 2012 1984 1987 normal 2003 3 37.2 39.1 -1.9 36 49 1978 2012 1984 1987 normal 4 33.8 35.7 -1.9 36 49 1978 2017 1984 1987 normal 5 33.7 34.7 -1.0 46 39 1978 2012 1986 1987 normal 1997 6 35.4 35.8 -0.4 54 30 1978 2012 1986 1987 normal 1946,2013 7 37.0 38.3 -1.3 38 45 1978 2012 1984 1987 normal 1952,2019 8 40.6 41.6 -1.0 42 41 1978 2017 1984 1987 normal 2009 9 44.0 44.9 -0.9 42 41 1978 2017 1984 1987 normal 1953,1989,2009 10 47.1 47.8 -0.7 42 40 1978 2017 1986 1987 normal 11 49.4 49.9 -0.5 48 34 1978 2012,2017 1986 1987 normal 1957,2007 12 50.6 50.8 -0.2 55 27 1977 2012 1986 1987 top-third 1974,2010 18 45.8 45.8 0.0 60 21 1979 2017 1987 1974 top-third 1974 24 50.8 50.8 0.0 62 18 1978 2017 1987 1955 top-third 2008 36 50.5 50.8 -0.3 54 24 1979 2018 1987 1956 top-third 1954,1990,1993,2009 48 50.4 50.7 -0.3 50 26 1980 2019 1987 1957 normal 1993,2015 60 50.1 50.7 -0.6 42 32 1981,1982 2020 1986 1987 normal 1994