I just figure on bad weather while I'm hunting. Enjoy the nice, clear, sunny days when they happen. Doesn't really matter to me which of my rifles I carry, none of them have melted in the rain or frozen in the snow. I'll put a piece of tape over the muzzle to keep out water, and at the end of the day I'll wipe down the metal with an oily rag. No problem.
Mostly I hunt central Washington, in the Cascade Mtns. Time to time I make a trip to Wyoming for mule deer or elk. If I hunted more often somewhere like the Olympic Peninsula, where rainfall is measured in feet, not inches, or SE Alaska, or coastal British Columbia, I might be more interested in a stainless/synthetic rifle. Otherwise each of my rifles have handled the bad weather that they're exposed to year after year. No big deal.
I do have one rifle with a laminated stock, two with synthetic stocks, and a couple of the rifles have stainless steel barrels, but I'll happily hunt in rain & snow with my walnut & blue steel rifles too.
Regards, Guy