This plugin looks/works great.
I waned it to translate to my language (sl_SI) but as I can see its not using recomendet translation method I18n (http://codex.wordpress.org/I18n_for_WordPress_Developers)
Once implemented it would make the code much, much, much more readable, and doing the translations even more.
please fix this in next release
http://wordpress.org/extend/plugins/weather-and-weather-forecast-widget/
