1991-2020 Degrees Fahrenheit 1 16.7 24.2 -7.5 22 71 1955 2012 1923 1926 bottom-third 2 8.2 17.2 -9.0 10 83 1913 2012 1923 1926 bottom-third 3 4.4 13.3 -8.9 10 83 1912 2012 1917 1926 bottom-third 4 -99 12.8 -99 -99 -99 2014 2012 normal 5 -99 15.6 -99 -99 -99 1979 2012 normal 6 -99 20.0 -99 -99 -99 1920 2012 normal 7 -99 25.0 -99 -99 -99 1920 2012 normal 8 -99 29.7 -99 -99 -99 1920 2012 normal 9 -99 33.7 -99 -99 -99 1951 2012 normal 10 -99 36.4 -99 -99 -99 1951 2012 normal 11 -99 37.8 -99 -99 -99 1951 2012 normal 12 -99 37.9 -99 -99 -99 1951 2012 normal 18 -99 31.8 -99 -99 -99 1951 1999 normal 24 -99 37.8 -99 -99 -99 1952 2017 normal 36 -99 37.8 -99 -99 -99 1952 2000 normal 48 -99 37.8 -99 -99 -99 1952 2002 normal 60 -99 37.7 -99 -99 -99 1953 2002 normal