1991-2020 Degrees Fahrenheit 1 52.8 53.4 -0.6 41 34 1967 2015 1949 1949 normal 2000 2 47.1 47.2 -0.1 46 29 1967 2010 1949 1949 normal 1968 3 40.7 40.7 0.0 50 25 1956 2012 1949 1949 top-third 1973 4 35.6 35.3 0.3 50 24 1967 2012 1949 1949 top-third 5 32.7 31.6 1.1 59 14 1971 2012 1949 1949 top-third 1999 6 31.2 30.3 0.9 58 14 1971 2012 1949 1949 top-third 7 32.2 30.9 1.3 61 11 1971 2012 1949 1949 top-third 8 33.7 32.7 1.0 59 13 1971 2012 1949 1949 top-third 9 36.2 35.5 0.7 58 14 1956 2012 1949 1949 top-third 2020 10 39.0 38.5 0.5 58 14 1971 2012 1949 1949 top-third 2020 11 41.5 41.0 0.5 57 14 1963 2012 1949 1949 top-third 1998 12 42.9 42.8 0.1 53 17 1959,1963 2012 1949 1949 top-third 18 -99 38.8 -99 -99 -99 1971 2017 normal 24 -99 42.9 -99 -99 -99 1966,1967,1971 2013 normal 36 -99 43.1 -99 -99 -99 1967 2012 normal 48 -99 43.0 -99 -99 -99 1966,1968 2013 normal 60 -99 43.1 -99 -99 -99 1967 2013 normal