There is also Vieather, which I'm using currently. Atmosphere and Amazing Weather are top notch apps with transparent Live Tiles too, as has been mentioned.
All of these have transparent live tiles, accurate (at least for my location) weather forecasts and (very importantly!) toast notifications for weather alerts and conditions (except for the fourth one, which is the only free app among the four in the list).
Saw your reply in the other weather posts, but let me thank you here, too, for giving us a nice app! I especially appreciate the toast notifications for chances of precipitation. :smile: