1901-2000 Degrees Fahrenheit 1 43.9 45.8 -1.9 46 84 1940 1950 1895 1896 normal 1919,1973 2 44.9 46.6 -1.7 42 87 1977 1950 1896 1896 bottom-third 1962 3 47.7 49.1 -1.4 35 94 1977 1932 1896 1896 bottom-third 1960 4 50.8 53.0 -2.2 19 110 1977 1932 1896 1896 bottom-third 1915,1969 5 56.4 57.5 -1.1 36 93 1977 1932 1896 1896 bottom-third 6 60.4 61.4 -1.0 34 95 1977 1932 1896 1896 bottom-third 1944,1981 7 63.3 64.2 -0.9 30 99 1977 1932 1896 1896 bottom-third 1924,1938,1958,1959,1988,1998 8 65.2 66.0 -0.8 29 100 1977 1932 1896 1896 bottom-third 1905,1936,1961,1973,1996 9 65.8 66.6 -0.8 26 103 1977 1999 1896 1896 bottom-third 1905,1982 10 65.7 66.4 -0.7 31 98 1977 1999 1896 1896 bottom-third 1964 11 64.7 65.4 -0.7 27 102 1977 2017 1896 1896 bottom-third 1921,1948,1997 12 62.5 64.0 -1.5 11 118 1977 2017 1896 1896 bottom-tenth 1959 18 -99 63.2 -99 -99 -99 1969,1977 2017 normal 24 -99 64.0 -99 -99 -99 1970 1923 normal 36 -99 64.0 -99 -99 -99 1970 2019 normal 48 -99 64.0 -99 -99 -99 1970 2020 normal 60 -99 64.0 -99 -99 -99 1971 2020,2021 normal