Not permitted to load HTML into signature block...but this looks cool:
<span style="display: block !important; width: 180px; text-align: center; font-family: sans-serif; font-size: 12px;"><a href="http://www.wunderground.com/cgi-bin/findweather/getForecast?query=zmw:18954.1.99999&bannertypeclic k=wu_macwhite" title="Richboro, Pennsylvania Weather Forecast" target="_blank"><img src="http://weathersticker.wunderground.com/weathersticker/cgi-bin/banner/ban/wxBanner?bannertype=wu_macwhite&airportcode=KDYL&F orcedCity=Richboro&ForcedState=PA&zip=18954&langua ge=EN" alt="Find more about Weather in Richboro, PA" width="160" /></a><br><a href="http://www.wunderground.com/cgi-bin/findweather/getForecast?query=zmw:18954.1.99999&bannertypeclic k=wu_macwhite" title="Get latest Weather Forecast updates" style="font-family: sans-serif; font-size: 12px" target="_blank">Click for weather forecast</a></span>