This may or may not have to do with the fact that I once used the testingcheatsenabled cheat and switched from one season to another, but here's the thing. If it's summer in game, it still shows very low, winter-like temperatures, my plants are all dormant and people walk around in outerwear. I have no idea how to reset things to normal - any suggestions?

Thanks in advance!

I hope you've backed up your hood recently. If so, then use that. I'm not gonna worry you by telling you your 'hood is corrupted, but it might be. I'm no expert, so let's wait for Mootilda to show up, shall we?