I only installed it yesterday... not sure... right now it's always calling for light rain but it's not Like it even says it this morning at 10am but pretty clear outside right now! lol I have to see about the other weather service options I guess!
The default one, that is, OpenWeatherMap isn't that accurate at some places.
The other one, Dark Sky, is available only through in-app purchase, as it is costly. Per person, I have to pay them more than I charge from a user. That is because my app updates the weather in the background every 30 minutes.
You can see the screenshots on the Store to see what Dark Sky offers. Also you can check their website to see if it is accurate. I would recommend that before buying because I don't want a user unsatisfied after paying me.
I am developing this app solely for my love towards Windows Mobile. And to do something more than just using the phone, to save the platform.