1991-2020 Degrees Fahrenheit 1 47.7 50.0 -2.3 27 70 1967 1934 1955 1957 bottom-third 2 44.2 47.2 -3.0 14 83 1955 1934 1955 1957 bottom-third 3 44.3 44.1 0.2 67 30 1936 1934 1957 1947 top-third 4 42.2 41.8 0.4 74 23 1950 1934 1957 1953 top-third 1995 5 41.6 40.2 1.4 84 12 1950 1934 1957 1934 top-third 2000 6 41.1 40.3 0.8 79 17 1937 1934 1957 1940 top-third 7 41.9 41.9 0.0 67 29 1949,1950 1934 1957 1953 top-third 2010 8 44.7 44.6 0.1 67 29 1949 1934 1957 1953 top-third 1966,1983 9 47.2 47.6 -0.4 59 37 1949 1934,2015 1957 1953 normal 1982,2007 10 49.3 50.2 -0.9 52 44 1949 2015 1957 1953 normal 1982,1987 11 50.8 51.5 -0.7 57 39 1949 2016 1957 1953 normal 1989,2012 12 51.5 52.0 -0.5 61 35 1949 2016 1957 1953 normal 1938,1946,1966,1994 18 46.2 48.1 -1.9 23 72 1950 2016 1957 1954 bottom-third 1963,1965,1971,1973,1994 24 50.3 52.0 -1.7 26 69 1950 2016 1957 1954 bottom-third 1965,1972 36 49.6 52.0 -2.4 10 84 1957 2016 1957 1955 bottom-third 1933 48 49.3 52.0 -2.7 6 87 1952,1957 2018 1957 1956 bottom-tenth 60 49.5 52.0 -2.5 4 88 1933,1952 2018,2019 1952 1957 bottom-tenth 1950