The answer is to pick the weather provider that matches your locations weather the closest. For instance, I have a choice of 4 weather providers and by Googling their sites and investigating, I discovered that they all used different weather stations for their reports. One is a mile away and the others are 12, 20 and 25 miles from my location. Obviously, the weather provider using the weather station a mile away is a lot more accurate than the airport 25 miles away behind a range of hills.