1991-2020 Degrees Fahrenheit 1 21.6 29.9 -8.3 14 62 1951 2012 1949 1949 bottom-third 2 12.7 24.5 -11.8 2 74 2019 2016 1949 1949 bottom-tenth 3 8.6 21.7 -13.1 2 74 1950 1992 1949 1949 bottom-tenth 4 9.1 21.1 -12.0 2 73 1950 1992 1949 1949 bottom-tenth 5 13.2 22.9 -9.7 4 71 1979 2000 1949 1949 bottom-tenth 6 18.5 26.4 -7.9 4 71 1979 2012 1949 1949 bottom-tenth 1950 7 24.8 30.9 -6.1 7 68 1952 2012 1949 1949 bottom-tenth 1956 8 30.3 35.5 -5.2 7 68 1952 2012,2016 1949 1949 bottom-tenth 9 34.4 39.2 -4.8 8 67 1952 2012,2016 1949 1949 bottom-third 10 -99 41.5 -99 -99 -99 1952 2016 normal 11 -99 42.5 -99 -99 -99 1952 2016 normal 12 -99 42.4 -99 -99 -99 1952 2016 normal 18 -99 37.0 -99 -99 -99 1952 2013 normal 24 -99 42.4 -99 -99 -99 1952 2000 normal 36 -99 42.4 -99 -99 -99 1952 2000 normal 48 -99 42.4 -99 -99 -99 1953 1992 normal 60 -99 42.4 -99 -99 -99 1954 1992 normal