1991-2020 Degrees Fahrenheit 1 60.6 55.8 4.8 70 5 1976 1985 2000 1986 top-tenth 2 61.4 60.9 0.5 50 25 1976 1985 2000 1999 top-third 3 65.5 66.0 -0.5 40 35 1967 1985 2000 1999 normal 4 69.3 69.9 -0.6 35 40 1967 2016 2000 1999 normal 1963 5 71.7 72.4 -0.7 33 42 1967 2016 2000 1999 normal 1984,2009 6 72.7 73.6 -0.9 23 52 1967 2016 2000 2000 bottom-third 1953,1963,1968,1987,1988,2000,2008 7 72.5 73.5 -1.0 18 57 1967 2016 1997 2000 bottom-third 1961,1964,1965,1968 8 71.6 72.3 -0.7 21 54 1976 2016 1997 2000 bottom-third 1968,1969,1982,1983 9 69.7 70.7 -1.0 15 60 1976 2016 1997 2000 bottom-third 1961,1971,1979,1989 10 68.2 68.8 -0.6 33 42 1967 2016 1997 2000 normal 2021 11 -99 66.9 -99 -99 -99 1966,1967,1968,1976,2014 2017,2019,2020 normal 12 -99 65.5 -99 -99 -99 1964,1966,1969,1976 2016 normal 18 -99 68.2 -99 -99 -99 1968 2017 normal 24 -99 65.4 -99 -99 -99 1967 2017 normal 36 -99 65.4 -99 -99 -99 1968,1969 2018 normal 48 -99 65.4 -99 -99 -99 1969 2019 normal 60 -99 65.3 -99 -99 -99 1970 2020 normal