1991-2020 Degrees Fahrenheit 1 38.1 44.3 -6.2 2 60 2014 2012 1984 1983 bottom-tenth 2 39.0 40.4 -1.4 27 35 2015 2012 1982 1983 normal 3 35.1 38.3 -3.2 16 46 1978 2012 1982 1983 bottom-third 4 34.2 38.2 -4.0 11 51 1978 2012 1982 1983 bottom-third 5 36.6 39.7 -3.1 11 48 1970 2012 1982 1983 bottom-third 6 39.8 42.6 -2.8 11 48 1977 2012 1982 1983 bottom-third 7 43.7 46.3 -2.6 11 48 1977 2017 1982 1983 bottom-third 8 47.8 50.0 -2.2 13 46 1977 2017 1982 1983 bottom-third 1994,1996 9 51.0 53.0 -2.0 12 47 1977 2017 1982 1983 bottom-third 1967,1969,1981 10 53.1 55.0 -1.9 15 44 1977 2017 1982 1983 bottom-third 1967,1973 11 53.8 55.8 -2.0 10 49 1977 2012 1982 1983 bottom-third 1973,1980,2001,2014 12 53.6 55.8 -2.2 9 50 1977 2012,2020 1982 1983 bottom-third 1964,1969,1973,1980 18 50.1 51.3 -1.2 24 33 1978 2017 1983 1976 normal 1973 24 54.2 55.7 -1.5 16 41 1978 2017 1983 1976 bottom-third 1973 36 53.8 55.7 -1.9 7 48 1979 2022 1982 1983 bottom-third 1968,1971,1981 48 53.8 55.7 -1.9 8 45 1980 2022 1983 1983 bottom-third 1978,1983 60 53.8 55.6 -1.8 6 45 1981 2020 1983 1983 bottom-third 1968,1969,1979,1983