1991-2020 Degrees Fahrenheit 1 60.2 62.5 -2.3 27 52 1964 2014 1991 1993 normal 2 59.3 61.3 -2.0 35 44 1967 2014 1991 1993 normal 1962 3 59.2 60.2 -1.0 46 33 1975 2014 1991 1993 normal 1960,1966 4 58.2 59.4 -1.2 38 41 1948 2014 1991 1993 normal 2003 5 58.0 58.9 -0.9 47 32 1949 2014 1991 1993 normal 1958,2019 6 57.8 58.5 -0.7 48 31 1949 2014 1993 1993 normal 1958,1959,1980,1993 7 58.4 58.9 -0.5 52 27 1949 2014 1993 1993 normal 1993 8 59.4 59.8 -0.4 56 23 1949 2014 1993 1992 top-third 1987,2006 9 60.3 60.8 -0.5 57 22 1949 2016 1993 1993 top-third 1986,1988,1993,1998,2011 10 61.0 61.6 -0.6 52 27 1949 2016 1991 1993 normal 1980,2005,2010 11 61.6 62.2 -0.6 52 26 1949 2016 1991 1993 top-third 2000,2005,2010 12 62.0 62.5 -0.5 55 23 1949 2015,2016 1991 1993 top-third 2005 18 60.6 61.1 -0.5 58 20 1949 2015 1992 1993 top-third 1959,1984,1987,2006,2010 24 62.2 62.4 -0.2 61 16 1950 2016 1993 1993 top-third 1993,2005 36 62.2 62.4 -0.2 61 15 1950,1951 2016 1993 1994 top-third 1997 48 62.1 62.4 -0.3 59 16 1951 2017,2018 1993 1994 top-third 1995,1996,1997 60 61.9 62.3 -0.4 53 21 1952 2018 1993 1994 top-third 1999