1991-2020 Degrees Fahrenheit 1 29.8 30.8 -1.0 73 52 2000 2015 1895 1895 normal 2 33.3 35.9 -2.6 44 80 1976 2015 1895 1895 normal 2010 3 37.4 41.6 -4.2 13 109 1976 2015 1895 1895 bottom-third 4 45.4 47.5 -2.1 38 84 1976 1931 1895 1895 bottom-third 1988 5 50.9 52.4 -1.5 43 79 1976 1931 1895 1895 normal 1919,1969,1986 6 54.3 55.9 -1.6 36 86 1976 1931 1895 1895 bottom-third 7 56.8 57.9 -1.1 45 77 1976 1931 1895 1895 normal 1905,1960,1965,2004,2008 8 57.4 58.2 -0.8 59 63 1917 1931,2015,2021 1895 1895 normal 2014 9 56.7 57.2 -0.5 69 52 1917 2015 1895 1895 normal 1954,1964 10 54.3 55.3 -1.0 52 69 1917 2012 1895 1895 normal 1897,1902,1942,1957 11 50.9 52.8 -1.9 27 93 1917 2012 1895 1895 bottom-third 1945 12 48.0 50.5 -2.5 16 100 1917 2012 1895 1895 bottom-third 1937,1958,1996 18 -99 52.3 -99 -99 -99 1904 2012 normal 24 -99 50.5 -99 -99 -99 1904 1999,2017 normal 36 -99 50.5 -99 -99 -99 1904 2012,2017,2018 normal 48 -99 50.5 -99 -99 -99 1904 2018 normal 60 -99 50.5 -99 -99 -99 1980 2020,2021 normal