Halley 12Z station_level_pressure
2001   987.3   989.1       -   979.6   990.7   982.3       -   976.2   979.3   971.3       -   978.2
2002       -   979.6   988.1       -   990.5       -   986.9   978.9   984.5   988.5   985.8   982.9
2003       -   987.6       -   979.6   981.7   992.2   984.7   976.4       -   983.8       -   991.3
2004       -       -       -       -       -       -   980.5   981.3   982.6       -       -       -
2005       -   979.3   983.9   979.0   987.3   990.8   984.7   981.3   985.0   983.9   986.1   995.7
2006   986.1   986.6   983.4   983.0       -   985.9   979.3   986.7   984.1   977.8   978.8   985.7
2007   987.3       -   985.2   991.7       -       -       -   983.1   989.6   981.6   984.4   978.6
2008   984.1   981.4   983.0   986.6   986.8   984.2   980.5   979.6   985.8   977.0   978.5   977.0
2009   981.6       -       -       -       -       -       -       -       -       -       -       -