1901-2000 Degrees Fahrenheit 1 50.2 49.3 0.9 73 57 1960 2012 1966 1967 normal 2 42.5 45.7 -3.2 14 116 1947 2012 1960 1967 bottom-third 1905,1924 3 40.2 43.8 -3.6 10 120 1978 2023 1960 1967 bottom-tenth 4 41.4 43.2 -1.8 25 104 1978 2020 1966 1967 bottom-third 1966 5 42.2 44.4 -2.2 17 112 1902,1904,1977 1932 1964 1967 bottom-third 1931,1936,1964 6 44.8 47.0 -2.2 13 116 1977 1932 1958 1967 bottom-tenth 7 47.6 50.3 -2.7 6 123 1977 1932 1918 1967 bottom-tenth 8 50.8 53.5 -2.7 3 126 1977 2020 1918 1967 bottom-tenth 1904 9 53.5 56.1 -2.6 3 126 1977 1932,2017,2020 1918 1967 bottom-tenth 10 55.1 57.8 -2.7 2 127 1977 2017 1968 1967 bottom-tenth 11 55.8 58.6 -2.8 2 127 1977 2020 1968 1967 bottom-tenth 12 56.2 58.6 -2.4 2 127 1977 2020 1918 1967 bottom-tenth 1918 18 53.0 54.7 -1.7 4 124 1905 2017 1964 1967 bottom-tenth 1941,1964,1969 24 56.9 58.5 -1.6 4 124 1905 2017 1905 1967 bottom-tenth 36 57.2 58.5 -1.3 4 123 1970 2018,2020 1906 1967 bottom-tenth 1979 48 57.4 58.5 -1.1 6 120 1970 2020 1905 1967 bottom-tenth 60 57.3 58.5 -1.2 2 123 1970 2020 1968 1967 bottom-tenth 1971