1991-2020 Degrees Fahrenheit 1 75.3 76.4 -1.1 12 62 1955 2015 1997 1998 bottom-third 2013 2 76.3 77.6 -1.3 5 69 1955 1968 1989 1998 bottom-tenth 1989 3 77.1 78.5 -1.4 2 72 1955 2019 1955 1998 bottom-tenth 1952 4 77.4 79.0 -1.6 2 72 1955 2019 1955 1998 bottom-tenth 5 77.4 79.1 -1.7 2 72 1955 2019 1955 1998 bottom-tenth 6 77.3 79.0 -1.7 2 72 1955 2019 1955 1998 bottom-tenth 7 77.1 78.7 -1.6 3 71 1955 2019 1955 1998 bottom-tenth 8 76.7 78.2 -1.5 3 71 1955 2019 1955 1998 bottom-tenth 9 76.2 77.6 -1.4 3 71 1955 1984 1955 1998 bottom-tenth 10 75.7 77.0 -1.3 2 72 1955 1984 1955 1998 bottom-tenth 1952 11 75.5 76.6 -1.1 3 70 1955 1984 1955 1998 bottom-tenth 12 75.3 76.4 -1.1 2 71 1955 1984 1955 1998 bottom-tenth 1952 18 76.2 77.3 -1.1 3 70 1955 2020 1956 1998 bottom-tenth 24 75.3 76.4 -1.1 3 69 1955 2020 1956 1998 bottom-tenth 36 75.5 76.4 -0.9 4 67 1956 2017,2021 1957 1998 bottom-tenth 48 75.8 76.4 -0.6 7 63 1955 2017,2020,2022 1959 1998 bottom-tenth 1959 60 75.9 76.3 -0.4 6 63 1955,1956,1958 2020 1960 1998 bottom-tenth 1960,2000,2001,2002