That is why I said if it effects it your gun needs some work. Most new guns come with free floated barrels, and even bedded actions.
People have been hunting for over a hundred years with wood stocked guns in some of the nastiest conditions so I wouldn't be afraid to get your gun wet.
Lord if that were the case you would never be able to hunt in half the states, surely not Michigan. Heck in MI you would never be able shoot, it's either snowing, sleeting, raining or hot and muggy

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Wouldn't be a bad idea to shoot in different climates to make sure though.
Paul