I’ve never survived long enough to know: is snow a tangible, believabley-functioning thing in Cata? If not, now seems a potentially good time to figure it out.
I’d rather have acid rain back, since it caused pain but wasn’t lethal. I’d be ok with toxic rain if the pools and clouds were a potentially blockading hazard rather than a harm-guarantee. Otherwise, it’s just hide indoors and pray until it’s done. At least acid rain you could survive, at a price. Irradiation causes major damage by comparison.
If region-based weather becomes a thing (I heard acid rain might be more common near portals?) I still think ash fallout like the sort you’d get from a volcano might be interesting - after all we do have lava veins as a thing. Idk where the seismic activity is coming from but whatever. Ashfall would include coughing for the unprotected and somewhat reduced visibility - idk about lowering mobility for everything (ash piles up after all) but it’d be, again, ideally a hazard rather than lethal.