1991-2020 Degrees Fahrenheit 1 26.2 33.2 -7.0 11 73 1977 2023 1984 1987 bottom-third 2 32.2 35.8 -3.6 28 56 1977 2016 1986 1987 bottom-third 3 37.1 39.5 -2.4 29 54 1977 2016 1987 1987 normal 1966,1987 4 40.7 44.0 -3.3 17 66 1977 2016 1984 1987 bottom-third 5 46.1 49.1 -3.0 17 66 1977 2016 1982 1987 bottom-third 6 50.8 53.6 -2.8 16 67 1977 2016 1982 1987 bottom-third 1948 7 54.8 57.2 -2.4 19 64 1977 2016 1982 1987 bottom-third 1997 8 57.1 59.1 -2.0 21 61 1977 2016 1984 1987 bottom-third 1957,1965,1969,1984,1990 9 57.8 59.6 -1.8 27 55 1977 2016 1984 1987 bottom-third 10 57.2 59.1 -1.9 27 55 1977 2016 1985 1987 bottom-third 1967,1996,2004 11 56.0 57.6 -1.6 30 51 1977 2016 1985 1987 normal 2004 12 54.0 55.8 -1.8 32 49 1968 2013,2017 1985 1987 normal 1984,2001 18 53.1 55.0 -1.9 27 53 1945,1964,1978 2017 1985 1987 normal 1943,1961,1989 24 54.1 55.7 -1.6 30 48 1969 2013 1985 1987 normal 1989 36 54.3 55.7 -1.4 34 41 1970 2022,2023 1987 1976 normal 1950 48 54.2 55.6 -1.4 25 47 1964,1970,1971 2023 1987 1987 normal 1986,1987 60 54.1 55.6 -1.5 19 50 1970 2023 1986 1987 bottom-third 1952,1974,1977