1991-2020 Degrees Fahrenheit 1 36.8 34.2 2.6 66 12 1983 2021 2000 2001 top-third 2 39.7 39.3 0.4 51 27 2000 2021 2000 2001 normal 3 43.6 45.3 -1.7 23 55 1976 2021 2000 2001 bottom-third 4 51.1 51.4 -0.3 43 35 1976 2021 2000 2001 normal 1949 5 56.8 56.7 0.1 49 29 1985 2021 2000 2001 normal 1946,2014 6 61.0 60.6 0.4 56 21 1976 1954 2000 2001 top-third 7 63.3 62.8 0.5 58 19 1976 1954 2000 2001 top-third 1971,1988,1990 8 63.3 63.2 0.1 52 25 1961,1976 1998 2000 2001 top-third 9 62.7 62.3 0.4 54 23 1961 1954 2000 2001 top-third 1955,1977 10 60.5 60.7 -0.2 46 31 1951,1961 2012 2000 2001 normal 2000 11 58.5 58.4 0.1 54 23 1951 2012 1997 2001 top-third 1988,2020 12 56.6 56.1 0.5 61 16 1979 2012 1997 2001 top-third 1986,2005,2015 18 58.7 57.6 1.1 68 8 1951 2012 2001 1999 top-tenth 24 56.8 56.1 0.7 64 12 1979 2012 1998 2001 top-third 1955,1987 36 56.8 56.1 0.7 65 10 1961,1962,1980 2012,2017 1999 2001 top-third 2006 48 56.9 56.0 0.9 71 3 1961 2001 2000 2001 top-tenth 60 57.0 56.0 1.0 72 1 1961,1962 2002 2001 2002 highest