1991-2020 Degrees Fahrenheit 1 47.9 47.8 0.1 92 38 1943 2017 1948 1945 top-third 2 41.4 41.7 -0.3 91 39 1926 2012 1948 1946 top-third 3 37.1 36.7 0.4 105 25 1904,1914 2012 1948 1945 top-third 1957 4 34.9 33.5 1.4 116 14 1904 2012 1948 1921 top-third 1921 5 33.6 32.9 0.7 110 18 1904 2012 1948 1921 top-third 1983 6 35.4 34.1 1.3 115 11 1904 2012 1948 1949 top-tenth 7 37.2 36.6 0.6 110 16 1918 2012 1948 1949 top-third 2000 8 40.4 39.9 0.5 110 16 1918 2012 1948 1949 top-third 9 43.7 43.4 0.3 109 17 1904 2016 1948 1949 top-third 10 46.4 46.3 0.1 109 17 1904 2012 1948 1949 top-third 1999 11 48.0 48.3 -0.3 106 20 1904 2012 1948 1932 top-third 1932,2009,2018 12 48.6 49.2 -0.6 100 26 1918 2012,2016 1948 1932 top-third 18 41.7 44.1 -2.4 56 66 1905 2017 1948 1942 normal 1930,1977 24 47.3 49.1 -1.8 71 51 1905 2017 1948 1938 normal 1981 36 47.0 49.1 -2.1 64 54 1906 2018 1948 1939 normal 1934,1939,1960 48 46.8 49.1 -2.3 53 62 1906 2019,2023 1944 1934 normal 1961,1968 60 -99 49.0 -99 -99 -99 1906,1918,1920 2020,2023 normal