The cars I care about I park inside all winter in a heated garage, and run a dehumidifier in the summer as needed. But it the winter when the DD's are covered in crap I leave them outside so they don't thaw out, and trash the car, garage, and my tools. I feel the constant freeze/thaw cycle is worse for a vehicle. Any shade helps too in the summer. Hail is always my biggest fear, which has messed up 2 vehicles twice so far, and the house.