[NordSteve]

One factor is your distance from the nearest weather radar, and nearest airport with automated weather observation. This sort of prediction is heavily dependent on whether the precip is detected by sensing.

I've seen similar things in our area (Minnesota) where you drive through a snowstorm, but the radar shows nothing in theare.

[cogman10]

I've seen variations in weather literally 10 miles apart. With torrential rain at work and nothing at home.

I can't see how any weather predictor could be correct in that situation.

[importantbrian]

Living in Florida I've driven down the road and had it be raining on one side of the road and not raining on the other while the sun is shining.

[Fomite]

Yeah. There's a place nearby where I live that's used for a lot of outdoor recreation like fishing and rafting, and the two weather stations that serve that area are a long way away.