1991-2020 Degrees Fahrenheit 1 75.1 74.0 1.1 59 17 1976 2020 1992 1991 top-third 2 71.6 72.0 -0.4 49 26 1972 1991 1992 1991 normal 1983,2013 3 67.8 68.5 -0.7 41 34 1961,1976,1979 1991 1992 1991 normal 1970 4 63.0 64.1 -1.1 38 37 1961 1991 1992 1991 normal 5 57.6 59.1 -1.5 29 46 1960 1991 1992 1991 normal 1953,1962,1994,2014 6 52.3 54.3 -2.0 23 52 1978 1991 1989 1992 bottom-third 1968,1970 7 49.5 50.6 -1.1 37 38 1978 2012 1992 1991 normal 1964,1988,2007,2008 8 47.5 48.4 -0.9 45 30 1978 2012 1992 1991 normal 2004,2011 9 46.9 47.8 -0.9 43 31 1978 2012 1992 1991 normal 1975,1989 10 47.1 48.4 -1.3 34 40 1978 2012 1989 1992 normal 1952 11 48.6 50.0 -1.4 33 41 1978 2012 1989 1992 normal 1971,1997,2009 12 50.1 51.9 -1.8 26 48 1978 2012 1984 1992 normal 1952,2015 18 50.9 52.7 -1.8 28 45 1979 2012 1982 1992 normal 1960,1975,1997 24 50.5 51.8 -1.3 32 40 1978 2017 1990 1992 normal 1953,1983,1990,1996 36 51.8 51.7 0.1 54 16 1979 2018 1991 1992 top-third 1991 48 51.5 51.7 -0.2 51 17 1980 2019 1991 1992 top-third 1991,2006,2010 60 51.3 51.6 -0.3 44 22 1981 2020 1990 1992 top-third 1995