1991-2020 Degrees Fahrenheit 1 35.3 41.2 -5.9 1 75 1967 2011 1967 1966 lowest 2 43.8 46.3 -2.5 11 65 1972 1963 1965 1966 bottom-third 1965,1981 3 49.7 51.8 -2.1 13 63 1972 2011 1962 1966 bottom-third 1993 4 54.4 56.4 -2.0 12 64 1972 2011 1964 1966 bottom-third 5 57.9 59.5 -1.6 16 60 1976 2011 1965 1966 bottom-third 1951,1960,1989 6 59.4 60.6 -1.2 24 52 1986 2020 1965 1966 bottom-third 1954,1993 7 58.0 60.1 -2.1 7 68 1986 2015 1962 1966 bottom-tenth 1997 8 -99 58.5 -99 -99 -99 1972 2010 normal 9 -99 55.9 -99 -99 -99 1972 2010 normal 10 -99 53.1 -99 -99 -99 1972 2012 normal 11 -99 50.6 -99 -99 -99 1972,1978 2012 normal 12 -99 49.0 -99 -99 -99 1978 2012 normal 18 -99 52.9 -99 -99 -99 1978 2012 normal 24 -99 49.0 -99 -99 -99 1972,1978 2017 normal 36 -99 49.0 -99 -99 -99 1972 2012,2022 normal 48 -99 48.9 -99 -99 -99 1965,1972 2013 normal 60 -99 48.9 -99 -99 -99 1965 2020 normal