I have created a set of patches to Geo::METAR that improve the robustness of the parser and make it parse non-US METAR codes.
I have mailed them to the maintainer, but no response has materialised yet. I'd like other users of Geo::METAR to have a look at them.
My patches can be downloaded at http://koos.idefix.net/tmp/Geo-METAR-koos.patch (http://koos.idefix.net/tmp/Geo-METAR-koos.patch).
An open, cross-platform journaling program.
A scientific plotting package.