December marks the beginning of the dry season in the Caribbean, making it a popular time to trade cold weather for warm sun and clear waters. Generally, you can expect pleasant conditions, with low humidity, comfortable temperatures, and a very low risk of tropical storms. 
Here is a detailed breakdown of the wind, wave, temperature, and rainfall conditions for a December cruise.
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Fred Pickhardt
Marine Meteorologist
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About Fred Pickhardt
I am a marine meteorologist and sailed briefly with American Export Lines in the Far East trade after graduating from State University of New York Maritime College. I have extensive experience in weather analysis, weather forecasting, optimum ship routing, vessel performance evaluations and forensic weather event reconstructions. I founded Ocean Weather Services and as Owner and Chief Consultant currently provide optimum ship routing services and forensic marine weather reports to the maritime industry.