1991-2020 Degrees Fahrenheit 1 56.0 60.0 -4.0 8 72 1967 1992 1945 1945 bottom-tenth 2 54.0 59.1 -5.1 2 78 1975 2015 1945 1945 bottom-tenth 1952,1967 3 53.9 58.3 -4.4 4 76 1949 2015 1945 1945 bottom-tenth 1956 4 53.5 58.0 -4.5 6 74 1949 2015 1945 1945 bottom-tenth 1951,1955 5 53.8 57.7 -3.9 6 74 1949 2015 1945 1945 bottom-tenth 1946,1955,1975 6 54.2 58.2 -4.0 7 73 1949 2015 1945 1945 bottom-tenth 7 55.1 59.4 -4.3 5 75 1949 2015 1945 1945 bottom-tenth 8 56.4 60.6 -4.2 5 75 1949 2015 1945 1945 bottom-tenth 9 57.5 61.5 -4.0 4 76 1949 2016 1945 1945 bottom-tenth 1952 10 -99 62.2 -99 -99 -99 1949 2015 normal 11 -99 62.5 -99 -99 -99 1949 2015 normal 12 -99 62.5 -99 -99 -99 1949 2015 normal 18 -99 61.0 -99 -99 -99 1949 2015 normal 24 -99 62.4 -99 -99 -99 1950 2016 normal 36 -99 62.4 -99 -99 -99 1951 2016 normal 48 -99 62.3 -99 -99 -99 1952 2017,2018 normal 60 -99 62.3 -99 -99 -99 1952,1953 2018 normal