I think I should also mention that OWM seems to be retrieving the nearest weather (not even sure it’s a personal weather station, either) to the GPS coordinates.
And the weather we’re getting is really not appropriate for where we’re at, even though it’s only 10 miles away. It is on the other side of the valley (I can see the area from my house) and they have remarkably different temperatures/humidities at each point of the day.
Short of programming my own watering app (PHP?) and controlling OS from that thru the API, or watering manually, I’m really not sure where to go from here.