Lettau pressure 1986 - 991.8 990.1 979.4 992.7 990.6 978.6 979.9 976.3 972.0 974.6 981.9 1987 992.5 988.8 985.8 987.7 983.0 986.3 991.7 975.4 988.3 977.4 978.1 985.5 1988 988.7 984.1 985.2 981.4 989.0 995.4 974.9 975.4 982.6 988.6 981.4 983.6 1989 984.7 985.2 982.9 987.4 969.0 979.7 977.5 982.7 981.3 973.3 976.0 989.2 1990 988.7 982.9 985.8 991.3 996.8 985.3 995.7 979.3 970.2 980.6 982.7 983.5 1991 982.4 989.2 980.1 984.1 986.9 989.2 990.6 - - - 983.3 995.1 1992 988.6 994.7 988.0 984.2 989.5 992.9 - - - - 977.5 983.0 1993 996.0 978.6 985.3 981.0 982.6 - - - - - 979.5 984.1 1994 985.0 982.5 977.9 984.6 985.0 997.3 987.1 973.0 987.7 976.9 984.7 981.4 1995 981.2 981.0 991.0 982.0 980.9 986.2 - - - - 977.2 977.7 1996 985.9 - - - - - - - - - - 985.2 1997 - - - - - - - - - - - - 1998 - - 981.7 974.3 982.1 - - - - - - - 1999 - 987.2 983.9 980.4 976.4 999.4 979.1 981.8 981.0 964.1 - - 2000 - - 983.0 982.2 982.3 984.6 979.2 982.5 987.2 975.4 - - 2001 - - 983.4 978.1 983.5 981.4 985.6 981.8 976.2 971.2 - - 2002 - - 989.9 979.8 991.8 993.8 986.8 977.4 985.7 989.9 - - 2003 - - 984.1 977.4 977.9 992.3 978.2 976.9 979.9 972.4 - - 2004 - - 984.1 978.0 980.9 976.7 977.5 980.3 982.1 979.4 - - 2005 - - 982.1 979.2 980.1 989.2 980.0 976.2 975.6 970.7 - - 2006 - - 984.8 987.0 976.8 981.0 976.1 990.7 983.9 976.5 - - 2007 - 986.4 - - 988.6 989.3 1000.5 983.6 982.4 986.2 985.4 978.2 2008 982.7 984.6 988.4 989.5 986.6 981.9 983.9 987.6 - - - - 2009 - 990.4 985.6 989.6 993.7 996.0 993.5 992.7 987.0 979.7 985.7 984.4 2010 999.4 994.0 989.5 984.9 987.3 980.6 973.7 977.4 - - 975.6 991.0 2011 992.3 983.5 988.1 986.1 974.8 984.6 - - - - - - 2012 - - - - - - - - - - - - 2013 - - - - - - - - - - - - 2014 - 981.3 979.6 976.6 980.9 979.0 980.4 972.3 980.2 970.5 983.7 981.5 2015 983.1 975.5 978.9 977.4 981.5 980.8 973.0 975.0 971.4 976.0 973.7 983.9 2016 977.9 978.7 976.4 982.3 979.2 974.9 984.0 986.0 968.2 976.3 988.7 987.2 2017 992.2 986.6 986.6 979.2 972.7 978.3 976.3 972.3 973.0 980.0 973.5 983.0 2018 982.3 981.0 981.0 983.2 981.0 984.3 979.1 987.8 971.8 971.1 973.1 980.0 2019 984.5 985.5 982.2 978.1 983.1 969.7 984.3 980.1 968.7 978.4 989.2 992.9 2020 989.9 981.0 976.9 977.7 975.0 976.0 981.0 983.8 981.3 968.8 974.7 974.5 2021 978.3 974.7 984.4 977.9 982.2 978.2 984.9 984.9 971.1 974.7 971.7 971.5 2022 980.5 978.1 978.2 979.4 976.4 988.9 971.8 974.8 970.6 976.6 973.8 974.7 2023 977.0 981.4 981.8 988.9 978.2 985.6 982.5 984.0 976.4 973.1 980.0 976.1 2024 979.8 982.3 977.9 972.5 973.9 974.0 983.8 989.0 981.8 - - -