1991-2020 Degrees Fahrenheit 1 60.1 60.9 -0.8 35 55 1969 1995 1916 1914 normal 2 55.3 56.1 -0.8 40 49 1969 1988 1916 1914 normal 3 46.7 50.1 -3.4 9 80 1909 1977,1991 1916 1915 bottom-tenth 4 40.4 43.5 -3.1 20 67 1950 1977 1916 1915 bottom-third 1970 5 33.6 36.8 -3.2 23 64 1967 1987 1916 1915 bottom-third 1957,1975 6 27.1 31.5 -4.4 16 71 1950 2012 1916 1915 bottom-third 1974 7 22.9 28.6 -5.7 5 81 1950 2012 1920 1916 bottom-tenth 1996 8 21.8 28.3 -6.5 2 83 1979 2012 1920 1916 bottom-tenth 1996 9 23.2 29.8 -6.6 1 83 1920 2012 1920 1916 lowest 10 26.3 32.3 -6.0 1 82 1920 2012 1920 1916 lowest 11 29.6 35.0 -5.4 1 82 1920 2012 1920 1916 lowest 12 32.7 37.5 -4.8 2 81 1912 2012 1912 1916 bottom-tenth 18 -99 35.5 -99 -99 -99 1951 1999 normal 24 -99 37.5 -99 -99 -99 1951 2017 normal 36 -99 37.4 -99 -99 -99 1952 2000 normal 48 -99 37.4 -99 -99 -99 1952,1953,1969 2001 normal 60 -99 37.3 -99 -99 -99 1970 2002 normal