Marsh 18Z station_level_pressure 1970 992.4 985.7 993.3 982.3 987.8 994.6 992.9 992.4 988.4 991.5 989.0 989.6 1971 987.5 989.9 985.3 989.4 1001.4 993.1 997.9 983.3 989.4 990.6 983.8 992.8 1972 993.3 990.3 989.9 987.3 992.5 993.4 989.1 999.8 987.5 994.2 985.4 991.2 1973 991.3 984.9 983.1 979.6 987.7 995.9 1001.1 986.4 987.6 992.1 988.0 983.8 1974 - - - - - - - - - - - - 1975 992.2 986.0 985.2 989.5 991.2 997.8 995.6 989.2 991.0 984.1 984.9 983.8 1976 993.2 989.1 992.9 986.5 985.1 994.2 981.3 979.5 988.2 990.6 996.4 1000.0 1977 994.3 987.5 990.1 989.1 983.7 992.8 1000.9 992.9 983.0 987.7 987.4 996.0 1978 988.8 991.8 993.5 992.8 1002.3 984.1 1001.8 985.2 994.4 984.5 994.3 987.2 1979 995.1 989.0 995.1 984.6 997.8 990.0 989.1 988.5 991.9 986.3 993.5 996.7 1980 991.3 993.5 991.7 995.2 997.1 985.9 1000.0 995.6 993.3 990.6 986.0 994.1 1981 990.6 983.5 1000.1 998.4 993.2 995.9 996.8 990.2 991.0 990.3 982.7 987.8 1982 992.4 987.7 983.8 985.5 991.7 1002.3 990.2 996.6 993.0 985.8 991.0 994.8 1983 994.6 988.1 989.8 999.5 1000.5 993.4 989.7 990.2 993.5 985.2 982.2 986.8 1984 988.3 989.3 996.9 985.5 993.5 999.2 1000.2 991.4 998.2 990.8 984.3 1000.7 1985 995.2 984.5 989.1 988.9 995.0 1007.0 985.4 985.1 985.6 994.2 988.5 980.9 1986 985.3 988.8 989.4 988.9 998.0 981.9 984.4 984.5 986.6 992.4 982.8 984.3 1987 988.5 992.0 983.4 987.9 995.4 991.3 992.5 999.6 988.1 988.3 982.3 986.9 1988 992.3 989.6 986.8 991.3 996.8 994.1 989.8 999.1 991.1 999.7 981.8 982.7 1989 990.9 986.5 988.2 991.2 985.2 983.5 995.1 997.4 990.2 982.2 983.6 990.6 1990 989.6 991.1 984.2 990.4 1002.3 984.0 992.3 979.5 992.1 977.0 972.4 986.9 1991 986.7 990.9 988.6 990.5 987.1 989.7 991.4 986.7 996.8 984.7 987.3 997.3 1992 989.8 986.7 989.2 993.9 997.6 1000.8 995.6 989.9 986.9 985.4 993.3 994.6 1993 993.9 992.9 983.5 983.8 984.4 987.3 988.4 983.0 978.2 978.0 978.7 978.6 1994 978.2 980.4 987.9 989.9 991.2 991.4 989.4 985.0 975.3 985.1 988.5 983.7 1995 987.1 987.0 978.8 987.5 987.2 984.1 984.2 989.6 983.8 987.7 977.4 981.5 1996 985.8 984.7 981.2 991.3 980.8 987.0 984.7 984.9 990.5 980.7 972.9 983.7 1997 983.1 988.6 985.9 981.7 994.6 997.0 985.3 980.8 989.4 986.1 992.0 993.9 1998 981.5 989.7 985.0 990.6 995.0 991.0 973.2 980.3 985.5 975.5 978.2 978.0 1999 984.5 980.0 990.4 983.4 988.2 992.0 984.8 984.5 986.3 980.9 982.8 978.1 2000 976.9 990.2 996.9 982.6 993.2 991.7 998.8 987.0 996.4 984.1 989.2 983.4 2001 983.5 982.4 982.5 982.6 993.4 986.8 991.1 976.8 985.9 980.4 975.4 978.5 2002 983.2 981.5 986.6 982.9 988.2 986.2 990.0 993.9 997.2 983.5 984.8 985.0 2003 987.4 981.6 991.9 987.7 986.0 991.9 979.2 983.7 986.3 979.7 979.6 989.4 2004 981.8 992.3 983.7 987.0 990.0 983.7 986.3 986.2 974.1 984.7 990.1 986.0 2005 981.5 982.4 986.1 979.1 989.3 991.0 992.5 987.0 994.5 988.2 986.0 990.1 2006 987.5 990.7 976.5 987.6 983.6 992.9 988.8 994.4 986.7 986.3 977.8 980.6 2007 985.3 982.8 984.1 986.1 993.5 986.0 988.8 982.4 992.2 978.2 985.1 980.1 2008 982.6 984.3 985.7 982.2 988.1 988.3 991.0 985.6 995.6 979.2 979.1 977.4 2009 980.7 981.4 982.8 984.8 981.5 983.4 986.8 996.3 984.3 973.4 980.0 984.2 2010 - - - - - - - - - - - - 2011 - - - - - - - - - - - - 2012 - - - - - - - - - - - - 2013 - - - - - - - - - - - - 2014 - - - - - - - - - - - - 2015 - - - - - - - - - - - - 2016 - 981.3 981.0 - 997.9 987.5 - 989.8 - - - - 2017 - 990.7 998.5 989.7 - 983.8 980.7 - 974.8 979.2 983.4 - 2018 981.2 982.4 978.0 984.3 985.3 988.9 - 984.2 987.7 989.4 976.1 976.4 2019 980.1 986.3 987.1 983.3 985.1 988.4 997.3 990.9 985.6 985.0 982.4 988.9 2020 985.9 989.5 983.9 985.5 993.2 989.1 996.4 987.8 983.1 979.3 980.5 979.5 2021 982.8 984.7 981.2 984.7 992.1 992.0 988.0 980.6 981.5 976.8 983.0 979.1 2022 983.4 983.4 989.8 985.3 989.4 983.8 985.2 989.4 985.6 974.5 979.3 981.3 2023 981.5 984.3 978.0 984.9 980.6 990.6 990.1 981.9 990.8 978.7 979.5 982.4 2024 981.6 984.6 985.9 980.3 - - - - - - - -