If your area is near an airport or a reliable personal weather station, then Weather Underground works well. However, some personal weather stations can be fluky as I've seen weird data at times, and many of them can go offline and be unavailable. Areas far away from any official stations would need the weather.com data. It may not be quite as accurate as an airport observation, but it'll be far more reliable. So, I think weather.com is fine to use for this forum just to cover everyone here.