Is it possable to add PWS stickers to your signature? On another weather related forum you can post the image URL to your personal weather station and have current data from your own backyard displayed.
I have some various ones like these that I might have gotten part of them from the "gismotimetemp"/ site. I'm not sure. This changes the temperature as it changes! If this doesn't work, I probably can find the center important items that you have to have at the main site. Maybe the main part is "wunderground"/
Copy this and see what you get. I don't know if I can actually copy the image. I'll try it.