Weather Underground did gather data from a variety of sources (http://www.wunderground.com/weatherstation/index.asp http://www.wunderground.com/weatherstation/i

Weather Underground did gather data from a variety of sources (http://www.wunderground.com/weatherstation/index.asp http://www.wunderground.com/weatherstation/index.asp) and displayed more fine grain results that the "regular" person who cares about weather would never look at. I have Weather Underground, The Weather Network and the default Apple Weather app (which pulls from Yahoo I believe) and I always found Weather Underground to be more accurate on both a large scale and in their hourly reports.