1901-2000 Degrees Fahrenheit 1 22.4 29.4 -7.0 15 115 1978 2017 1902 1903 bottom-third 1947 2 21.0 28.0 -7.0 11 119 1978 2017 1895 1903 bottom-tenth 3 21.6 28.8 -7.2 4 125 1978 1932 1904 1903 bottom-tenth 1936,1963 4 25.3 31.9 -6.6 2 127 1977 1932 1904 1903 bottom-tenth 5 30.9 36.3 -5.4 4 125 1977 1932 1904 1903 bottom-tenth 6 36.7 41.2 -4.5 3 126 1977 1932 1904 1903 bottom-tenth 7 41.6 45.6 -4.0 3 126 1977 1932 1904 1903 bottom-tenth 8 45.7 49.3 -3.6 3 126 1977 1932 1904 1903 bottom-tenth 9 47.8 51.6 -3.8 3 126 1977 1932 1904 1903 bottom-tenth 10 49.5 52.6 -3.1 3 126 1918,1977 1932 1904 1903 bottom-tenth 11 49.6 52.4 -2.8 4 125 1918 1932 1904 1903 bottom-tenth 12 49.3 51.3 -2.0 5 124 1918 2017 1904 1903 bottom-tenth 1951 18 46.7 47.9 -1.2 13 115 1905 2017 1904 1903 bottom-tenth 1963,1997 24 50.4 51.3 -0.9 17 111 1905,1918 2017 1904 1903 bottom-third 1908,1911,1913,1925,1930,1959,1971,1982 36 50.3 51.3 -1.0 11 116 1979 2013,2018 1904 1903 bottom-tenth 1912,1964 48 50.7 51.3 -0.6 20 106 1980 2019 1904 1903 bottom-third 1929,1930,1965,1969 60 51.0 51.3 -0.3 36 89 1981 2020 1904 1903 bottom-third 1910,1916,1931,1961,1977,1978,1984