1901-2000 Degrees Fahrenheit 1 21.1 26.4 -5.3 18 112 1933 1934 1942 1951 bottom-third 2 20.0 24.2 -4.2 15 115 1949 1934 1949 1951 bottom-third 3 20.0 24.1 -4.1 11 118 1949 1934 1949 1951 bottom-tenth 4 22.4 26.0 -3.6 11 118 1949 1934 1949 1951 bottom-tenth 5 26.3 29.6 -3.3 9 120 1949 1934 1949 1951 bottom-tenth 6 31.1 33.8 -2.7 11 118 1949 1934 1949 1951 bottom-tenth 1962 7 35.5 38.1 -2.6 10 119 1949 1934 1949 1951 bottom-tenth 8 39.3 41.4 -2.1 8 121 1949 1934 1949 1951 bottom-tenth 9 40.8 43.1 -2.3 7 122 1949 1934 1949 1951 bottom-tenth 10 41.7 43.8 -2.1 6 123 1917 2015 1949 1951 bottom-tenth 1929 11 41.8 43.5 -1.7 9 120 1917 2015 1949 1951 bottom-tenth 12 40.6 42.6 -2.0 5 124 1949 2016 1949 1951 bottom-tenth 18 39.0 39.7 -0.7 24 104 1913,1917,1933 2016 1950 1951 bottom-third 1912,1931,1943 24 41.7 42.6 -0.9 17 111 1913 2016 1950 1951 bottom-third 1923,1972,1973 36 42.2 42.6 -0.4 34 93 1986 2016,2017 1951 1948 bottom-third 1946,1979 48 41.5 42.6 -1.1 2 124 1986 2018 1915 1951 bottom-tenth 1913,1915 60 41.9 42.6 -0.7 10 115 1917 2018 1933 1951 bottom-tenth 1918,1920,1924,1953