Why only METAR stations
There are numerous weather data services out there, including some providing 'crowed sourced' data, like weather underground and openweather or so, each providing APIs to access there data (and be it with an API key, that would have to be configured). Is there a reason to only use METAR and not add other services? It's especially a problem if you do not have an airport close nearby, like in my case. Since the gnome weather applet is depending on libgweather I think this really is a huge drawback.