I'd be more concerned about theft and damage from a hurricane if you store the bike in a shed. Most sheds aren't much of a match for a decent sized hurricane and the wind whips up salt laden air and sends it inland so even putting a bike in a shed can't keep it entirely free from salt exposure. I hung a bike in a barn in southern Wisconsin, completely away from any rain, but after a couple of years when I returned to see it, there was some rust on chromed parts like the pieces that held the brake to the fork and frame. I didn't find any rust on the painted parts of the frame.