December is forecasted to be a dry, cool month. The water temperature has lowered to the high 70s and I recommend divers bring full wetsuits, and if thin-blodded, bring a 5mm. The reefs are swept clean of sediment and algae. As a resut, the clear water can extend your visibility to 100 feet plus. Diving the wrecks, as well as diving the shallow sites between 40 to 50 feet, is an absolute pleasure. Crystal clear blue water create the right environment for dramatic pictures and the sun can be seen dancing on the clear sand as deep as 50 feet mingling with the shadows cast on the sand by lazy sharks swimming around. On your list of choices are the deep wrecks, as much as the medium/shallow sites where colors are vibrant and naturally lit. Make sure you bring a wind breaker for the surface intervals and enjoy all that the underwater world of Grand Bahama Island has to offer.