I was scuba diving in Key Largo on November 13 and was actually surprised on the water temperature. I thought that the water temperature would still be relatively warm until about December but it was actually on the borderline of being slightly chilly. My dive computer read the water temperature at about 75 degrees F but it always seems to inflate the readings a bit so I would imagine that the actual water temperature was a few degrees lower. Of course, it was still warmer than one trip I took down there during a January when I did my NAUI Advance course. The water temperature was 71 degrees F which was a bit too cold for a 3 mm wetsuit.
I am an adventurer but I don't want to be a warm adventurer, not one that is freezing in the water. Speaking of adventure, to see the Scuba Dive Adventurer line, see Scuba Diving Clothing.