1925-2000 Degrees Fahrenheit 1 1.7 11.7 -10.0 1 98 1963 2002 1963 1962 lowest 2 13.2 18.6 -5.4 5 94 1956 2002 1956 1962 bottom-tenth 3 23.0 25.9 -2.9 12 87 1956 2002 1956 1962 bottom-third 1985 4 29.6 31.8 -2.2 14 85 1956 1979 1956 1962 bottom-third 5 34.0 36.0 -2.0 11 88 1948,1956 2019 1956 1962 bottom-third 1988 6 36.0 38.2 -2.2 7 92 1955 2019 1956 1962 bottom-tenth 1939 7 36.5 38.1 -1.6 12 87 1955 2019 1956 1962 bottom-third 8 34.7 36.3 -1.6 10 89 1955 2019 1956 1962 bottom-tenth 1982,1992 9 31.9 33.5 -1.6 15 84 1927 2019 1961 1962 bottom-third 10 29.5 30.6 -1.1 22 77 1955 2019 1961 1962 bottom-third 1973,1982,2008 11 27.8 28.0 -0.2 37 62 1971 2019 1961 1962 normal 1960 12 25.9 26.0 -0.1 40 58 1971 2019 1962 1958 normal 18 30.2 30.0 0.2 42 56 1956 2019 1962 1958 normal 1950,1986,1990 24 25.8 25.9 -0.1 34 63 1956 2019 1962 1958 normal 1954,1983,2000,2009 36 25.8 26.0 -0.2 33 63 1973 2016 1962 1959 normal 48 25.7 25.9 -0.2 32 63 1974 2019 1962 1960 normal 1930,1985 60 25.6 25.9 -0.3 28 66 1975 2019 1962 1962 bottom-third 1933,1948,1954,1962