1991-2020 Degrees Fahrenheit 1 49.9 47.7 2.2 55 20 1977 1950 2004 2002 top-third 2002 2 48.6 48.9 -0.3 41 34 1977 1950 2004 2002 normal 3 51.9 51.2 0.7 51 23 1977 1974 2004 2002 top-third 2006 4 56.1 54.8 1.3 60 14 1977 2017 2004 2002 top-third 2023 5 59.9 59.1 0.8 58 16 1977 2017 2004 1999 top-third 6 63.2 62.9 0.3 54 20 1977 2017 2004 2002 top-third 2023 7 66.0 65.7 0.3 55 19 1977 2017 2004 1999 top-third 2023 8 67.7 67.4 0.3 54 20 1977 2017 2004 1999 top-third 1957 9 68.6 68.0 0.6 59 15 1977 2017 2004 1999 top-third 2021 10 68.1 67.6 0.5 60 14 1977 2017 2004 1999 top-third 1972,2021 11 67.4 66.7 0.7 61 13 1977 2017 2004 1999 top-third 12 65.6 65.4 0.2 55 19 1977 2017 2004 1999 top-third 2022 18 64.3 64.5 -0.2 42 30 1969 2017,2020 2004 2003 normal 1951,1956,1960 24 65.1 65.4 -0.3 43 29 1970 2020 2004 2003 normal 1952,1954,2003,2014 36 65.0 65.3 -0.3 39 31 1970 2019,2021 2004 2004 normal 1975,1989,2004 48 65.1 65.3 -0.2 44 24 1970 2020 1999 2000 normal 1954,1959,1960,1989,2006,2012 60 -99 65.2 -99 -99 -99 1970 2020,2021 normal