I haven't come across exactly what you are looking for.
What I suggest, however, is using live weather wallpapers. They serve the same purpose that you want but in a slightly different way.
Here are a few examples:
Weather Wallpaper by yitiaocailHM
Weather Screen by Hamster Beat - it's not free though
Animated Weather Widget, Clock by Mobilityflow Publishing - they list animated widgets under features in development
Unfortunately I can't provide links as I haven't reached my 10 post limit yet.