1991-2020 Degrees Fahrenheit 1 68.9 66.9 2.0 61 15 1967 2018 1954 1953 top-third 2 64.8 62.8 2.0 69 7 1961 2019 1954 1955 top-tenth 3 59.4 58.2 1.2 64 12 1960 2012 1954 1955 top-third 4 54.4 54.1 0.3 57 19 1958 2012 1954 1953 top-third 1974,1998,2002 5 50.6 51.0 -0.4 47 29 1958,1978 2012 1954 1953 normal 1952 6 48.4 49.5 -1.1 41 34 1978 2012 1954 1954 normal 1954 7 47.7 49.4 -1.7 28 47 1978 2012 1952 1954 normal 1952,1987 8 49.2 50.7 -1.5 29 46 1978 2012 1951 1954 normal 1973,2001 9 51.8 52.9 -1.1 39 36 1958,1977,1978 2017 1952 1954 normal 1971 10 54.3 55.3 -1.0 39 36 1958,1977 2017 1952 1954 normal 11 56.6 57.4 -0.8 40 35 1977 2012,2017 1952 1954 normal 12 58.1 58.8 -0.7 41 34 1977 2012 1952 1954 normal 2003,2010 18 54.9 55.7 -0.8 41 33 1970 2017 1952 1954 normal 24 58.3 58.8 -0.5 46 28 1978 2017 1953 1954 normal 1995,2001,2004 36 58.5 58.8 -0.3 49 24 1970,1979 2018,2019 1954 1955 top-third 1987 48 58.3 58.7 -0.4 46 26 1980 2019,2020 1954 1955 normal 1994,2004,2016 60 57.9 58.7 -0.8 30 41 1970 2020 1955 1954 normal 1975,1986