1901-2000 Degrees Fahrenheit 1 54.8 57.1 -2.3 35 95 1960 2012 1950 1956 bottom-third 1966 2 57.2 53.8 3.4 108 22 1941 2023 1956 1946 top-third 3 55.5 51.8 3.7 113 17 1978 2023 1956 1950 top-third 4 55.7 51.1 4.6 124 5 1978 2017 1956 1950 top-tenth 1932 5 55.2 52.0 3.2 119 10 1902 2017 1956 1950 top-tenth 6 57.1 54.3 2.8 120 9 1977 2017 1956 1950 top-tenth 1999 7 59.4 57.4 2.0 112 17 1977 2017 1956 1950 top-third 1949 8 62.2 60.2 2.0 114 15 1977 2017 1956 1950 top-third 9 64.1 62.5 1.6 113 16 1977 2017 1956 1952 top-third 1937,1952 10 65.5 64.1 1.4 110 19 1977 2017 1956 1955 top-third 1949 11 66.3 64.8 1.5 113 16 1977 2017 1956 1950 top-third 1907,1949 12 66.1 64.8 1.3 111 18 1977 2017 1956 1955 top-third 1897,1928,1955 18 62.0 61.3 0.7 90 38 1978 2017 1956 1955 top-third 1938,1944,1951 24 65.6 64.8 0.8 103 25 1978 2017 1956 1956 top-third 1927,1938,1945,1956,1974,1991 36 65.8 64.8 1.0 117 10 1970 2018 1956 1950 top-tenth 1922,1928,2001 48 65.7 64.8 0.9 115 11 1905,1970,1971 2020 1956 1952 top-tenth 1952 60 65.5 64.8 0.7 110 15 1970 2020 1956 1956 top-third 1924,1937,1956