1991-2020 Degrees Fahrenheit 1 63.8 63.6 0.2 46 30 1967 2004 1968 1965 normal 1957 2 59.2 58.8 0.4 56 20 1967 2019 1968 1960 top-third 3 52.6 53.6 -1.0 28 46 1967 2012 1968 1964 normal 2001 4 47.7 49.1 -1.4 27 47 1978 2012 1968 1964 normal 1962,1964,1980,1987,1994 5 44.2 46.0 -1.8 24 50 1978 2012 1968 1964 bottom-third 6 42.5 44.7 -2.2 20 53 1978 2012 1968 1965 bottom-third 7 43.1 45.0 -1.9 21 51 1978 2012 1968 1965 bottom-third 1964 8 45.0 46.5 -1.5 25 47 1978 2012 1968 1964 normal 1987,2001 9 47.7 49.0 -1.3 29 43 1978 2012 1968 1962 normal 1993 10 50.6 51.7 -1.1 31 41 1978 2012 1968 1962 normal 1997 11 53.0 54.1 -1.1 31 41 1963 2012 1968 1962 normal 1973,1981 12 54.5 55.6 -1.1 32 40 1963 2012 1968 1962 normal 1975,1980,1997 18 50.3 51.9 -1.6 17 52 1979 2017 1968 1960 bottom-third 1997 24 53.6 55.6 -2.0 5 63 1978 2017 1968 1967 bottom-tenth 1963,1967,1971 36 53.6 55.5 -1.9 6 58 1979 2022 1968 1967 bottom-tenth 1978,1980 48 53.6 55.5 -1.9 6 54 1966,1968,1970,1980 2019,2020,2022 1968 1967 bottom-tenth 1971 60 53.7 55.4 -1.7 7 50 1967,1970 2020 1968 1966 bottom-third 1966,1982