1991-2020 Degrees Fahrenheit 1 26.1 34.7 -8.6 13 80 1960 2012 1932 1942 bottom-third 2 25.3 28.5 -3.2 38 55 1936 2012 1941 1942 normal 3 19.6 25.0 -5.4 20 73 1936 2012 1940 1942 bottom-third 4 18.8 24.3 -5.5 16 76 1936 2012 1937 1942 bottom-third 1949 5 21.8 26.3 -4.5 23 69 1936 2012 1937 1942 bottom-third 6 26.4 30.3 -3.9 21 71 1936 2012 1937 1942 bottom-third 1984 7 -99 35.0 -99 -99 -99 1936 2012 normal 8 -99 39.7 -99 -99 -99 1936 2012 normal 9 -99 43.5 -99 -99 -99 1936 2012 normal 10 -99 46.1 -99 -99 -99 1936 2012 normal 11 -99 47.3 -99 -99 -99 1936 2012 normal 12 -99 47.3 -99 -99 -99 1936 2012 normal 18 -99 41.6 -99 -99 -99 1979 2017 normal 24 -99 47.3 -99 -99 -99 1952 2017 normal 36 -99 47.3 -99 -99 -99 1952 2017,2018 normal 48 -99 47.4 -99 -99 -99 1952 2018 normal 60 -99 47.4 -99 -99 -99 1952 2006 normal