I'm going to dissent from popular opinion here, depending on how nice your boat is in the first place. I had been looking for a used boat for quite a few months last spring and all through summer. It's really, really easy to tell when a boat has been left outside (even covered, even under a carport) in this area. Even with a covered carport, you still get moisture which turns to mold/mildew. It gets between all the seat cushions and it stains the threads. People use vinyl cleaner and/or bleach to remove it. When they use bleach it damages the upholstery and after even only one or two applications, bright white vinyl starts getting the yellowed look. The carpet never smells the same after it's been molded as well.
The suggestions for using dry z air or otherwise are good, but it can take only a couple of days to a week to fill up/use up one around here! So you have to check it often and replace the crystals or whatever.
I looked at a supposedly "babied" moomba which was kept under a carport. The guy had tarps around it as well so water couldn't blow in from the sides. He had a small heater (not sure it was marine specific) going all the time (supposedly) and he still had mold (of course he tried to clean/hide it).
If you winterize your boat, I'm not too worried about the freezing, it's the moisture that will kill you.
I had an old mastercraft that was kept out like you describe. In addition to the mold/mildew/freezing concerns, we also had "cat" problems. They snuck in and slept on the boat cover. Then they peed on it.
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