1991-2020 Degrees Fahrenheit 1 -99 75.2 -99 -99 -99 1976 1979 normal 2 -99 79.6 -99 -99 -99 1976 1977 normal 3 -99 83.2 -99 -99 -99 1976 1951 normal 4 -99 84.9 -99 -99 -99 1976 1951 normal 5 -99 85.5 -99 -99 -99 1976 1951 normal 6 -99 85.0 -99 -99 -99 1976 1951 normal 7 -99 83.6 -99 -99 -99 1976 2011 normal 8 -99 81.7 -99 -99 -99 1976 2011 normal 9 -99 79.4 -99 -99 -99 1987 2000,2011 normal 10 -99 77.1 -99 -99 -99 1987 2000 normal 11 -99 75.2 -99 -99 -99 1987 2000 normal 12 -99 74.2 -99 -99 -99 1987 2000 normal 18 -99 77.8 -99 -99 -99 1977 2000 normal 24 -99 74.2 -99 -99 -99 1988 2000 normal 36 -99 74.2 -99 -99 -99 1970 2000 normal 48 -99 74.2 -99 -99 -99 1971 1956 normal 60 -99 74.2 -99 -99 -99 1977,1979 1956 normal