Plastic-fantastic Daisy 880 or 901. They're accurate enough to hunt squirrels with at a reasonable (<25 yards) range and I just dry them off when I get home. Their irons are even useful enough that I can do without a scope as long as I stay in range.
I will not take my air rifles out in the rain. I just won't do it. About the only hunting I do in the rain is waterfowl hunting of course and bow hunting for deer. Other than that I stay home and wait for a nice day Jeff