1925-2000 Degrees Fahrenheit 1 12.1 10.8 1.3 60 40 1959 2019 1939 1932 normal 2 10.7 7.8 2.9 69 31 1972 2019 1939 1935 top-third 3 10.2 5.9 4.3 81 19 1971 2016 1939 1926 top-third 1993 4 9.8 5.4 4.4 82 17 1971 2016 1939 1931 top-third 5 8.7 6.6 2.1 65 34 1956 2016 1939 1935 normal 6 11.1 9.8 1.3 59 40 1956 2019 1938 1939 normal 1927,1937,1948 7 15.2 14.2 1.0 53 46 1971 2019 1938 1939 normal 1950 8 19.2 18.6 0.6 50 49 1971 2019 1938 1939 normal 9 22.9 22.4 0.5 50 49 1971 2019 1938 1939 normal 1948 10 25.5 25.1 0.4 47 52 1971 2019 1938 1939 normal 1930,1938,1992,1993 11 26.4 26.2 0.2 42 57 1956 2019 1938 1939 normal 1938,1960,1961 12 26.3 26.0 0.3 46 53 1956 2016 1938 1939 normal 1948,1982,2013 18 21.4 20.6 0.8 63 35 1972 2019 1938 1939 normal 1989,1996,1999 24 26.8 26.0 0.8 61 37 1972 2019 1939 1927 normal 1944 36 26.5 26.0 0.5 49 48 1973 2018 1938 1939 normal 1960,1992 48 26.7 25.9 0.8 59 37 1974 2019 1939 1929 normal 1984,2000,2009,2010,2013 60 26.3 25.9 0.4 42 53 1975 2019 1938 1939 normal 1993,2013