Last 2 mid-Decembers in Coz were simply perfect!I tend to avoid the northern Caribbean dive locations in the winter months due to the frequency of cold fronts/Nortes in places like Cozumel and GC, and the colder water and air temps in the Bahamas, etc. Like KathyV, I like May and June for most places in the Caribbean, but will go far south to Bonaire and Curacao any time of the year.