1991-2020 Degrees Fahrenheit 1 64.1 68.4 -4.3 3 76 1952 2006 1948 1947 bottom-tenth 2 63.0 66.9 -3.9 6 73 1952 2006 1948 1947 bottom-tenth 3 61.7 65.4 -3.7 6 73 1964 2014 1948 1947 bottom-tenth 4 60.6 64.1 -3.5 7 72 1964 2014 1948 1947 bottom-tenth 1950 5 58.8 62.9 -4.1 3 76 1952 2014 1948 1947 bottom-tenth 6 57.5 61.9 -4.4 1 78 1948 2014 1948 1947 lowest 7 56.8 61.1 -4.3 4 75 1950 2014 1948 1947 bottom-tenth 8 56.3 60.6 -4.3 4 75 1949,1950 2014 1948 1947 bottom-tenth 9 56.2 60.6 -4.4 2 77 1949 2014 1948 1947 bottom-tenth 1950 10 56.8 61.2 -4.4 3 76 1949 2014 1948 1947 bottom-tenth 11 57.7 61.9 -4.2 3 76 1949 2016 1948 1947 bottom-tenth 12 58.4 62.5 -4.1 3 76 1949 2016 1948 1947 bottom-tenth 18 59.2 62.3 -3.1 10 68 1949 2015 1946 1947 bottom-third 24 59.1 62.4 -3.3 7 71 1950 2016 1946 1947 bottom-tenth 1946,1955 36 59.3 62.4 -3.1 9 68 1950 2016 1948 1947 bottom-third 48 59.1 62.4 -3.3 7 69 1951,1952 2016,2017,2018 1948 1948 bottom-tenth 1954,1956 60 -99 62.3 -99 -99 -99 1952 2018 normal