1991-2020 Degrees Fahrenheit 1 58.2 61.4 -3.2 14 62 1952 2016 1988 1992 bottom-third 2 64.4 67.1 -2.7 13 63 1976 2019 1988 1992 bottom-third 3 69.8 71.2 -1.4 29 47 1976 2007 1992 1991 normal 4 73.1 73.5 -0.4 44 32 1976 2007 1992 1986 normal 2011 5 73.6 74.2 -0.6 41 35 1976 2007 1992 1991 normal 1969,1991,2013 6 72.5 73.3 -0.8 34 42 1976 2007 1992 1991 normal 1948,1985 7 70.2 71.5 -1.3 23 53 1976 2010,2019 1992 1991 bottom-third 1990,2009 8 67.3 68.9 -1.6 22 54 1976 2007 1992 1991 bottom-third 9 64.1 66.0 -1.9 21 55 1958 2016 1992 1991 bottom-third 10 61.8 63.4 -1.6 28 48 1979 2012,2017,2019 1992 1991 normal 1975 11 59.9 61.5 -1.6 26 48 1978 2016 1992 1992 normal 1959,1975,1980,1992 12 59.0 60.6 -1.6 29 45 1978 2016 1992 1991 normal 1975,1985,1989 18 62.7 64.8 -2.1 13 61 1977 2017 1984 1992 bottom-third 1964 24 58.9 60.6 -1.7 27 45 1979 2017 1989 1992 normal 1952 36 59.7 60.6 -0.9 41 29 1979 2018 1990 1992 normal 48 59.7 60.6 -0.9 41 27 1979 2019 1992 1992 normal 1992 60 59.5 60.5 -1.0 35 31 1964 2020 1992 1992 normal 1958,1992