I can't answer the tidal range part of it. The difference in tides, well, Monomoy is the borderline between what I would consider the Mid Atlantic and North Atlantic. Different tidal influences, different currents. Gulf Stream vs Labrador Current, maybe?
I do know this---in August, the water temps can be 70 degrees plus in Dennisport, and less than 10 miles away off Nauset, they can be about 62.
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