1991-2020 Degrees Fahrenheit 1 41.8 39.4 2.4 111 19 1929 1991 1929 1926 top-third 1977 2 28.4 37.8 -9.4 10 120 1929 1953 1929 1928 bottom-tenth 3 31.8 36.8 -5.0 20 106 1929 1958 1929 1928 bottom-third 1917,1928 4 32.9 38.0 -5.1 13 113 1937 1967 1929 1928 bottom-tenth 5 36.8 40.9 -4.1 14 110 1937 1967,2016 1929 1928 bottom-third 1985 6 40.7 45.1 -4.4 12 111 1937 1967 1929 1928 bottom-tenth 7 45.8 49.4 -3.6 16 107 1979 2015 1929 1928 bottom-third 1942 8 49.4 52.7 -3.3 16 107 1949 2015 1929 1928 bottom-third 1969 9 51.1 54.3 -3.2 15 108 1913,1917 2016 1929 1928 bottom-third 1955,1960 10 51.9 54.8 -2.9 16 107 1917 2016 1929 1928 bottom-third 1903,1912,1937 11 51.6 54.5 -2.9 12 111 1917 2016 1929 1928 bottom-tenth 1960,1985 12 51.0 53.8 -2.8 12 111 1949 2016 1929 1928 bottom-tenth 1903,1960 18 47.0 50.9 -3.9 2 118 1917 2016 1917 1929 bottom-tenth 24 50.8 53.8 -3.0 7 113 1956 2016 1917 1929 bottom-tenth 36 50.9 53.8 -2.9 3 115 1957 2016,2017 1914 1929 bottom-tenth 48 51.6 53.8 -2.2 14 102 1913 2016,2018 1923 1929 bottom-third 1912,1919 60 52.2 53.8 -1.6 31 83 1917 2017,2019 1925 1929 bottom-third 1908