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.
Cruising the Caribbean in December offers pleasant weather and ideal conditions for travel. This raises an academic question: how do seasonal weather patterns in tropical regions affect tourist behavior, destination choice, and the economic impact of cruise tourism?