1991-2020 Degrees Fahrenheit 1 -99 47.6 -99 -99 -99 1920 1981 normal 2 -99 43.9 -99 -99 -99 1912 2012 normal 3 -99 39.7 -99 -99 -99 1899 2012 normal 4 -99 36.9 -99 -99 -99 1912 1992 normal 5 -99 35.1 -99 -99 -99 1912 1992 normal 6 -99 35.5 -99 -99 -99 1912 2000 normal 7 -99 37.6 -99 -99 -99 1912 2000 normal 8 -99 40.9 -99 -99 -99 1912 1981 normal 9 -99 44.4 -99 -99 -99 1912 1981 normal 10 -99 47.6 -99 -99 -99 1912 1981 normal 11 -99 49.5 -99 -99 -99 1912 1981 normal 12 -99 50.2 -99 -99 -99 1912 1981 normal 18 -99 45.3 -99 -99 -99 1909,1916 2000 normal 24 -99 50.2 -99 -99 -99 1909 2000 normal 36 -99 50.2 -99 -99 -99 1918 2000 normal 48 -99 50.3 -99 -99 -99 1918 2002 normal 60 -99 50.3 -99 -99 -99 1912,1918,1920 2003 normal