1991-2020 Degrees Fahrenheit 1 34.1 36.1 -2.0 61 69 1978 2017 1968 1962 normal 2 32.0 34.2 -2.2 47 83 1978 2023 1968 1964 normal 1914,1964 3 32.2 34.9 -2.7 42 87 1978 1932 1968 1967 bottom-third 1901,1967,1986 4 35.2 37.4 -2.2 44 85 1977 1932 1968 1965 normal 1917 5 39.0 41.1 -2.1 36 93 1977 1932 1968 1965 bottom-third 1961 6 43.5 45.6 -2.1 33 96 1977 1932 1968 1965 bottom-third 1926,1929,1959 7 47.7 49.7 -2.0 32 97 1977 1932 1968 1965 bottom-third 8 51.0 52.8 -1.8 29 100 1977 1932 1968 1965 bottom-third 1899,1945,1959,1996 9 53.1 54.9 -1.8 26 103 1977 1932 1968 1965 bottom-third 1973,1975,1994,2001 10 53.8 55.8 -2.0 21 108 1977 1932 1968 1966 bottom-third 1929,1959 11 53.7 55.7 -2.0 18 111 1977 1932 1968 1966 bottom-third 1959,1962,1964,2010 12 52.9 54.8 -1.9 26 103 1977 2017 1968 1965 bottom-third 18 48.9 51.7 -2.8 7 121 1918,1977 2017 1968 1967 bottom-tenth 24 52.2 54.8 -2.6 5 123 1978 2017 1968 1967 bottom-tenth 36 52.2 54.7 -2.5 4 123 1979 2018,2019 1968 1967 bottom-tenth 48 52.3 54.7 -2.4 4 122 1980 2020 1969 1968 bottom-tenth 60 52.7 54.7 -2.0 6 119 1981 2020 1968 1968 bottom-tenth 1968,1982