1991-2020 Degrees Fahrenheit 1 63.7 65.3 -1.6 43 51 1973 2011 1938 1939 normal 2 60.4 61.1 -0.7 58 36 1958 2011 1939 1939 normal 1939 3 56.3 57.2 -0.9 60 34 1958 2017 1939 1938 normal 1957,1994,2014 4 51.2 54.0 -2.8 26 66 1958 2017 1937 1939 bottom-third 1944,1984 5 50.3 52.3 -2.0 35 57 1973 2017 1939 1938 normal 1965,2001,2007 6 50.3 52.4 -2.1 30 62 1973 2017 1939 1938 bottom-third 1969 7 52.6 54.3 -1.7 31 61 1977 2017 1939 1938 normal 1948,1965 8 55.6 56.9 -1.3 37 55 1977 2017 1939 1938 normal 1948,1994 9 58.2 59.7 -1.5 34 58 1977 2017 1939 1938 normal 1971 10 60.7 62.1 -1.4 37 55 1977 2017 1939 1938 normal 1951,1984 11 62.6 63.8 -1.2 43 49 1977 2017 1939 1938 normal 1956 12 63.5 64.7 -1.2 41 50 1977 2017 1939 1938 normal 1932,1946,1948,1956 18 58.9 60.6 -1.7 29 61 1977 2017 1937 1939 bottom-third 1936,1964 24 63.1 64.7 -1.6 33 56 1977 2000 1938 1939 normal 1983,1987 36 63.6 64.6 -1.0 49 38 1977 2018 1939 1936 normal 1991,1992,1995,1998 48 63.1 64.6 -1.5 31 54 1977 2019,2020 1939 1938 normal 1986 60 62.8 64.5 -1.7 18 65 1977 2020 1940 1939 bottom-third 1943,1946,1960,1970,1987