Halley_6 12Z msl_pressure 2012 - - 986.4 991.7 989.3 987.2 989.2 986.1 985.3 979.3 990.2 992.1 2013 989.8 984.8 983.4 984.5 987.1 993.4 987.5 996.0 992.6 985.6 981.0 986.7 2014 993.7 989.4 987.6 989.9 993.6 992.2 985.1 988.0 995.7 984.4 984.3 983.0 2015 988.0 982.7 982.7 983.3 985.9 988.9 980.1 979.2 981.2 989.0 982.9 989.7 2016 984.8 985.9 978.4 982.1 982.4 983.5 982.4 988.5 978.5 981.8 991.5 993.3 2017 996.0 986.6 989.8 982.5 983.8 989.5 983.3 985.2 976.9 989.2 979.9 984.9 2018 - - - - - - - - - - - - 2019 - - - - - - - - - - - - 2020 - - - - - - - - - - - - 2021 - - - - - - - - - - - - 2022 - - - - - - - - - - - - 2023 - - - - - - - - - - - - 2024 - - - - - - - - - - - -