1901-2000 Degrees Fahrenheit 1 35.9 40.1 -4.2 22 108 1978 1927,2017 1964 1966 bottom-third 2007 2 37.7 38.7 -1.0 45 85 1978 2017 1966 1965 normal 3 37.9 38.9 -1.0 43 86 1978 1932 1966 1965 bottom-third 4 40.7 41.0 -0.3 49 80 1977 1932 1966 1965 normal 1926,1931 5 43.6 44.6 -1.0 34 95 1977 1932 1964 1966 bottom-third 1896,1951,1980 6 47.6 48.9 -1.3 23 106 1977 1932 1964 1966 bottom-third 1910,1945,1951,1984,1988 7 51.4 52.7 -1.3 19 110 1977 1932 1964 1966 bottom-third 1979,2015 8 54.8 55.8 -1.0 23 106 1977 1932 1964 1966 bottom-third 1910,1996 9 56.7 57.8 -1.1 21 108 1977 1932 1964 1966 bottom-third 1973,1993,1996 10 57.4 58.6 -1.2 17 112 1977 2017 1964 1966 bottom-third 1951,1993 11 57.4 58.5 -1.1 19 110 1977 2017 1964 1966 bottom-third 1940,1993 12 56.6 57.7 -1.1 12 117 1977 2017 1963 1966 bottom-tenth 1904,1948,1993,2015 18 53.8 54.7 -0.9 20 108 1978 2017 1964 1966 bottom-third 1902 24 56.9 57.7 -0.8 21 107 1978 2017 1964 1966 bottom-third 1981 36 57.2 57.7 -0.5 26 101 1979 2018 1965 1966 bottom-third 1986,1998 48 57.1 57.7 -0.6 21 105 1980 2019,2020 1966 1960 bottom-third 1977,1983,1984,1996 60 56.9 57.7 -0.8 12 113 1980,1981 2020 1966 1966 bottom-tenth 1905,1906,1966,1968,1969,1973