1901-2000 Degrees Fahrenheit 1 51.0 50.5 0.5 73 57 1958 2018 1996 1997 normal 2 50.4 49.1 1.3 86 44 1978 1950 1997 1990 normal 3 49.1 48.9 0.2 66 63 1977,1978 1932 1996 1997 normal 4 49.8 50.5 -0.7 46 83 1977 1932 1996 1997 normal 1896,1976 5 52.8 53.5 -0.7 49 80 1977 1932 1996 1997 normal 2009 6 56.7 57.2 -0.5 49 80 1977 1932 1996 1997 normal 7 59.8 60.4 -0.6 45 84 1977 1932 1996 1997 normal 1971,2011 8 62.4 62.9 -0.5 43 86 1977 1932 1996 1997 bottom-third 2001 9 63.7 64.6 -0.9 28 101 1977 1932 1993 1997 bottom-third 10 64.2 65.3 -1.1 21 108 1977 1932 1993 1997 bottom-third 1963,1966,1973 11 63.8 65.3 -1.5 11 118 1977 1932 1993 1997 bottom-tenth 1908,1918,1964,1993 12 63.8 64.6 -0.8 31 98 1977 2017 1997 1996 bottom-third 18 61.5 62.1 -0.6 35 93 1977,1978 2017 1997 1996 bottom-third 2004 24 63.7 64.6 -0.9 21 107 1977,1978 2017 1994 1997 bottom-third 1905,1941,1965,1980,2011 36 63.9 64.6 -0.7 26 101 1970,1978 2018 1996 1997 bottom-third 1983,1996,2015 48 64.0 64.6 -0.6 26 100 1970 2019,2020 1997 1994 bottom-third 1902,1986 60 63.8 64.6 -0.8 22 103 1970 2020,2021 1997 1996 bottom-third 1983