1991-2020 Degrees Fahrenheit 1 68.3 63.5 4.8 66 1 1976 1965 1964 1965 highest 2 70.1 69.1 1.0 50 17 1976 2016 1964 1963 top-third 3 74.8 73.9 0.9 50 17 1976 2021 1964 1963 top-third 1973 4 77.9 77.9 0.0 45 22 1976 2015 1964 1963 top-third 1981,1982,1994,2007,2009 5 80.0 80.2 -0.2 35 32 1976 2015 1964 1963 normal 6 80.8 81.5 -0.7 32 35 1976 2011 1955 1964 normal 2014 7 80.5 81.5 -1.0 24 43 1976 1998 1965 1964 normal 8 80.0 80.7 -0.7 26 40 1976 2011 1952 1964 normal 1982,1983,1984 9 77.8 79.3 -1.5 16 50 1976 2011 1952 1964 bottom-third 1952,1979,1981 10 75.4 77.4 -2.0 10 55 1976 2011 1965 1964 bottom-third 11 73.7 75.4 -1.7 12 53 1970 2011 1965 1964 bottom-third 1969,1978 12 72.1 73.8 -1.7 12 53 1970,1976,1987 2011 1965 1964 bottom-third 1984,2010 18 75.1 76.3 -1.2 15 50 1976 2012,2022 1965 1964 bottom-third 1990 24 72.2 73.7 -1.5 12 51 1976 2012 1965 1956 bottom-third 1967,1973,1975 36 -99 73.7 -99 -99 -99 1970 2000 normal 48 -99 73.7 -99 -99 -99 1971 2001 normal 60 -99 73.6 -99 -99 -99 1970 2002 normal