1991-2020 Degrees Fahrenheit 1 36.4 38.3 -1.9 33 56 1984 2012 1984 1988 normal 2 33.1 35.1 -2.0 41 48 2015 2012 1987 1988 normal 1938,1952,1955,1992 3 33.3 33.4 -0.1 64 25 2015 2012 1988 1983 top-third 1937 4 32.9 34.0 -1.1 55 33 1948,1959 2012 1987 1988 normal 5 35.5 36.2 -0.7 60 28 1948 2012 1988 1985 top-third 1985 6 37.9 39.3 -1.4 51 37 1940 2012 1987 1988 normal 2009 7 41.6 43.0 -1.4 49 39 1940,1941 2012 1987 1988 normal 1985,2005 8 45.7 46.7 -1.0 56 32 1941 2012 1988 1984 normal 1976,1984 9 48.8 49.8 -1.0 56 32 1941 2012 1988 1984 normal 1976 10 50.6 51.6 -1.0 54 34 1941 2012 1988 1985 normal 1950,2014 11 51.2 52.2 -1.0 54 34 1941 2012 1988 1985 normal 1976,2004 12 50.8 51.9 -1.1 54 34 1941 2012 1988 1985 normal 1960,2003,2005 18 46.5 47.6 -1.1 52 35 1941 2023 1988 1984 normal 2005 24 50.3 51.8 -1.5 42 45 1941 2023 1988 1986 normal 36 50.1 51.8 -1.7 37 49 1941 2023 1988 1987 normal 48 50.2 51.8 -1.6 35 50 1941 2023 1988 1988 normal 1950,1974,1976,1977,1984,1988 60 50.3 51.7 -1.4 38 46 1941 2023 1985 1988 normal 1951,1952,1957,1976,1985