1991-2020 Degrees Fahrenheit 1 58.0 59.7 -1.7 38 50 1939 2016 1937 1935 normal 2 57.0 58.1 -1.1 45 41 1949 2014,2015 1938 1935 normal 3 57.2 57.2 0.0 60 26 1949 2015 1935 1934 top-third 1934,1943,1991,2005 4 58.4 59.1 -0.7 51 34 1949 2018 1935 1934 normal 1941,1982,2012 5 -99 62.7 -99 -99 -99 1949 2018 normal 6 -99 67.0 -99 -99 -99 1949 2018 normal 7 -99 70.9 -99 -99 -99 1942 2018 normal 8 -99 73.9 -99 -99 -99 1942 2021 normal 9 -99 75.8 -99 -99 -99 1942 2018,2021 normal 10 -99 76.4 -99 -99 -99 1942 2021 normal 11 -99 76.1 -99 -99 -99 1942 2021 normal 12 -99 75.2 -99 -99 -99 1942 2018 normal 18 -99 72.5 -99 -99 -99 1945 2018 normal 24 -99 75.2 -99 -99 -99 1943,1966 2018 normal 36 -99 75.2 -99 -99 -99 1944,1966 2018 normal 48 -99 75.2 -99 -99 -99 1945 2018 normal 60 -99 75.1 -99 -99 -99 1976 2018 normal