https://www.polygon.com/2017/12/11/16749834/pokemon-go-extreme-weather-pop-up

Pokémon Go’s dynamic weather system went live this weekend, coinciding with some of the most dramatic seasonal changes of the year — at least, for those of us here on the East Coast. And while it’s always better to be safe than sorry, Pokémon Go’s baked-in extreme weather warnings proved themselves to already be way out of whack.

Now that the augmented reality game is responsive to real-world weather changes, players will find their maps covered with snow, rain, intense sunlight and other effects. When these conditions become unsafe for players to venture out into, Pokémon Go does something responsible: It warns and discourages players from using the game until things are safer.