1991-2020 Degrees Fahrenheit 1 55.8 60.0 -4.2 4 74 1964 1997 1948 1947 bottom-tenth 2 54.5 58.8 -4.3 2 76 1964 1992 1948 1947 bottom-tenth 3 53.2 57.8 -4.6 1 77 1948 1992 1948 1947 lowest 4 52.1 56.8 -4.7 1 76 1948 1992 1948 1946 lowest 5 52.1 55.7 -3.6 6 71 1949 2014,2015,2016 1946 1948 bottom-tenth 6 51.4 55.0 -3.6 5 72 1949 2015 1948 1946 bottom-tenth 1962 7 51.6 55.2 -3.6 4 73 1949 2015 1948 1946 bottom-tenth 1962 8 52.7 56.2 -3.5 4 73 1949 2015 1948 1946 bottom-tenth 1962 9 53.8 57.2 -3.4 3 74 1949 2015 1948 1946 bottom-tenth 1950 10 54.8 58.0 -3.2 4 73 1949 2015 1948 1946 bottom-tenth 11 55.5 58.6 -3.1 4 72 1949 2015 1948 1946 bottom-tenth 12 56.1 58.9 -2.8 6 69 1949 2015 1948 1948 bottom-tenth 1963,1976 18 -99 57.6 -99 -99 -99 1949,1950 2015,2016 normal 24 -99 58.8 -99 -99 -99 1950 2016 normal 36 -99 58.8 -99 -99 -99 1950 2016 normal 48 -99 58.8 -99 -99 -99 1951,1952,1955,1956 2018 normal 60 -99 58.7 -99 -99 -99 1952,1953,1956 2018 normal