The simple way to start would, of course, be the vision impairing weather effects like rain, fog, snow, and dust. That kind of stuff I think we can all agree would be relatively simple to put in at release. Don't know about the optics making you more effective during said conditions, at release, but definitely it would be fun to have thermal optics during fog. I can't imagine thermal optics being as effective through dust, snow, and rain because of all the particles in between and light reflections, but that's a real life issue and not so much an issue for games haha. But later I think it would be awesome to see weather affecting vehicles and weapons. That would just be cool. And far too tempting to want to fly my Scythe through a hurricane just to drop a bunch of rounds on a tank column despite the risks
