I used the Dark Sky app since it came out in 2012. I used to consistently get notifications about precipitation with Dark Sky, that were consistently accurate. The Apple weather application seems less motivated to send me notifications with any sort of regularity. I almost never get them now, even with fresh iOS installs. I haven't moved either.

And just anecdotally, Dark Sky was a delight to use. Apple Maps makes it a chore to extract the same utility from their app.