1925-2000 Degrees Fahrenheit 1 51.7 54.3 -2.6 21 78 2008 1936 1972 1971 bottom-third 2 48.6 51.1 -2.5 13 86 2012 1936 1972 1971 bottom-third 1971 3 45.6 47.5 -1.9 20 79 1972 2005 1972 1969 bottom-third 1951 4 42.4 44.0 -1.6 22 77 1972 2005 1972 1970 bottom-third 1987,1999,2021 5 39.2 40.8 -1.6 23 76 1972 2016 1972 1970 bottom-third 1952 6 36.3 38.2 -1.9 16 83 1972 1926 1972 1970 bottom-third 2008 7 34.5 36.6 -2.1 12 86 1972 1926 1972 1970 bottom-third 8 34.2 35.9 -1.7 16 82 1972 1926 1972 1970 bottom-third 1979 9 34.7 36.5 -1.8 13 85 1972 1926 1972 1970 bottom-third 1943,2007 10 35.9 37.8 -1.9 10 88 1972 1926 1972 1970 bottom-tenth 1966,1982 11 37.6 39.4 -1.8 11 87 1972 1926 1972 1970 bottom-third 12 39.3 40.8 -1.5 14 84 1956,1972 1926 1972 1970 bottom-third 18 37.2 39.9 -2.7 3 95 1972 1927,2016 1972 1971 bottom-tenth 24 38.3 40.8 -2.5 2 95 1972 1927 1972 1971 bottom-tenth 36 38.1 40.8 -2.7 1 95 1973 1928 1973 1972 lowest 48 38.7 40.8 -2.1 2 93 1974 1929 1973 1972 bottom-tenth 1975 60 38.9 40.7 -1.8 4 90 1975 1930 1973 1972 bottom-tenth