TAA:I am thinking of going to Key Largo in the second week of December. What are the conditions like then? What thickness wetsuit/semi-dry would you recommend?
December can be a great time to dive the Upper Keys. Water temps are in the upper 70's to lower 80's so a 3 or 5 mil would be fine. Most importantly would be a hood to keep your head warm. As for the weather just keep an eye on the weather channel or give a dive shop a call. Remember the weather in Miami is not the same as in the Keys.
Hope you have a great time and if you have any more questions please don't hesitate to call.
Good Diving,