Weather Wallpaper is a mortscript that changes S2U2 wallpaper based on current weather condition. Now there is support for Weatherpanel, HTC Weather, and the original Yahoo feed (based on notiweather script).

Release notes:

A slight modification to the script that will hopefully fix some of the refresh issues. I have ran this for a week and have not encountered coming out of standby without S2U2 lock screen coming up. Please let me know how it goes for you. I also have made a new naming convention. The “u” version refers to the version of the script which will display Last Updated time (like the old v.33). Again, this “u” version will be posted on the third post like before. Thanks goes out to Holmann.

http://forum.xda-developers.com/showthread.php?t=390841