That is not entirely true
All you need for condensation is a temperature differential.
Let's pretend we left a dark blue CS uncovered. Now there is 2 feet of snow sitting on the decks but one day in late March the out door temp rises to 48 degrees F. The interior of the boat is heated by the sun through the hull yet the interior surface of the cabin roof is the temperature of snow or 32 degrees F. So what do you suppose happens when the interior of the boat gets to 54 degrees but the cabins roof is 32F. You guessed it condensation forms on the interior skin and begins dripping. I've witnessed this many, many times and on boats with perfectly dry decks..
-Maine Sail / CS-36T
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