1925-2000 Degrees Fahrenheit 1 -12.1 2.2 -14.3 2 98 2012 1981 1934 1933 bottom-tenth 2 -10.1 3.0 -13.1 1 98 1934 2001 1934 1933 lowest 3 -2.6 5.9 -8.5 3 96 1943 2001 1934 1933 bottom-tenth 4 3.5 10.8 -7.3 1 98 1934 2003 1934 1933 lowest 5 10.5 16.7 -6.2 1 98 1934 2003 1934 1933 lowest 6 16.9 22.2 -5.3 1 98 1934 2003 1934 1933 lowest 7 21.9 26.6 -4.7 1 98 1934 2003 1934 1933 lowest 8 24.9 29.4 -4.5 1 98 1934 2003 1934 1933 lowest 9 26.3 30.3 -4.0 1 98 1934 2003 1934 1933 lowest 10 26.2 29.6 -3.4 2 97 1956 2018 1934 1933 bottom-tenth 11 24.6 27.9 -3.3 2 97 1956 2016 1934 1933 bottom-tenth 12 22.7 26.0 -3.3 2 97 1956 2020 1934 1933 bottom-tenth 18 21.5 24.7 -3.2 3 95 1957,1972 2020 1934 1933 bottom-tenth 24 23.2 26.0 -2.8 3 95 1957 2017 1934 1933 bottom-tenth 36 24.0 25.9 -1.9 6 91 1957 2017,2018 1934 1933 bottom-tenth 1976 48 24.3 25.9 -1.6 5 91 1975 2020 1934 1933 bottom-tenth 60 24.9 25.9 -1.0 11 84 1976 2020 1934 1933 bottom-third 1935,1956,1958,1960,1968