1991-2020 Degrees Fahrenheit 1 25.5 36.2 -10.7 13 117 1930 1953 1907 1908 bottom-tenth 2 29.4 35.5 -6.1 12 114 1949 1953 1909 1908 bottom-tenth 1915,1928 3 33.6 37.6 -4.0 16 110 1979 1967 1899 1908 bottom-third 1952 4 37.7 41.3 -3.6 13 111 1979 1967 1909 1908 bottom-third 5 43.0 46.2 -3.2 21 102 1979 1967 1909 1908 bottom-third 1973 6 47.9 51.1 -3.2 18 105 1979 1967 1909 1908 bottom-third 7 51.9 54.6 -2.7 21 102 1949 2015 1904 1908 bottom-third 1928,1942,1955 8 53.4 56.1 -2.7 16 107 1917 2022 1903 1908 bottom-third 1903,1910,1950,1969 9 53.6 56.5 -2.9 12 111 1917 2016,2022 1909 1908 bottom-tenth 10 53.5 56.0 -2.5 16 107 1917 2022 1904 1908 bottom-third 1903,1904,1928,1955,1969,1985 11 52.6 55.1 -2.5 17 106 1949 2016 1904 1908 bottom-third 1910,1922 12 51.4 53.8 -2.4 17 106 1930,1949 2016 1904 1908 bottom-third 1900,1922 18 51.0 52.9 -1.9 30 90 1930 2016 1904 1908 bottom-third 1924,1931,1933,1938 24 51.8 53.8 -2.0 20 100 1957 2016 1904 1908 bottom-third 1920,1923,1949 36 52.0 53.8 -1.8 27 91 1914,1957 2016,2017 1905 1908 bottom-third 1920,1987 48 52.0 53.8 -1.8 26 90 1914,1915,1917 2016,2018 1906 1908 bottom-third 1925 60 52.2 53.8 -1.6 31 83 1917 2017,2019 1908 1909 bottom-third 1951