1901-2000 Degrees Fahrenheit 1 12.7 28.4 -15.7 1 129 1950 1953 1950 1949 lowest 2 21.7 29.6 -7.9 2 127 1949 1934 1949 1948 bottom-tenth 3 28.4 31.9 -3.5 10 119 1949 1900 1949 1948 bottom-tenth 4 32.2 35.7 -3.5 5 124 1949 1934 1949 1948 bottom-tenth 1916 5 37.5 40.0 -2.5 12 117 1949 2015 1949 1948 bottom-tenth 1930 6 41.7 43.9 -2.2 10 119 1949 2015 1949 1948 bottom-tenth 7 44.6 46.8 -2.2 6 123 1949 2015 1949 1948 bottom-tenth 1956 8 46.2 48.1 -1.9 5 124 1949 2015 1949 1948 bottom-tenth 1956,1985,1986 9 47.1 48.5 -1.4 12 117 1949 2015,2016 1949 1948 bottom-tenth 1916,1930 10 47.1 48.2 -1.1 15 114 1949 2015,2016 1949 1948 bottom-third 1909,1960 11 46.3 47.3 -1.0 20 109 1949 2016 1949 1948 bottom-third 1928,1955,1960 12 44.7 46.1 -1.4 10 119 1949 2016 1949 1948 bottom-tenth 1912 18 43.0 45.4 -2.4 1 127 1950 2016 1950 1949 lowest 24 43.9 46.1 -2.2 1 127 1950,1957 2016 1950 1949 lowest 1957 36 45.0 46.1 -1.1 4 123 1957 2017 1930 1949 bottom-tenth 1922,1930 48 45.1 46.1 -1.0 5 121 1952 2018 1923 1949 bottom-tenth 60 45.3 46.1 -0.8 6 119 1953 2019 1924 1949 bottom-tenth 1914,1917,1921,1923,1958