The idea for this map first occurred to us when we had daily highs in the 100s and all the attendant warnings and suffering. We thought it would be nice to highlight some Pokéstops in air-conditioned locations.
Then the rain came. Luckily, though, this list works just as well for inclement weather—there are only indoor places here, mostly places you might want to hang out even if you weren't caught up in Poké fever.
As with all things Pokémon Go, we are heavily indebted the local subreddit for this info. Know of a great indoor/climate-controlled Pokéstop not on the list? Let us know in the comments.