1901-2000 Degrees Fahrenheit 1 48.0 50.2 -2.2 40 90 1940 1950 1895 1895 bottom-third 1968,1986 2 -99 50.7 -99 -99 -99 1977 1950 normal 3 -99 53.0 -99 -99 -99 1977 1932 normal 4 -99 56.6 -99 -99 -99 1977 1932 normal 5 -99 60.7 -99 -99 -99 1977 1932 normal 6 -99 64.1 -99 -99 -99 1977 1932 normal 7 -99 66.5 -99 -99 -99 1977 1932 normal 8 -99 68.2 -99 -99 -99 1977 1932 normal 9 -99 68.8 -99 -99 -99 1977 1999 normal 10 -99 68.6 -99 -99 -99 1977 1999 normal 11 -99 67.7 -99 -99 -99 1977 2016,2017 normal 12 -99 66.5 -99 -99 -99 1977 2020 normal 18 -99 65.7 -99 -99 -99 1978 1923,2017 normal 24 -99 66.5 -99 -99 -99 1970 2020 normal 36 -99 66.5 -99 -99 -99 1970 2021 normal 48 -99 66.5 -99 -99 -99 1970 2020 normal 60 -99 66.5 -99 -99 -99 1970 2020,2021 normal