Over the Caribbean during December winds tend to be mostly from the east or northeast averaging forces 4-5 (11-21 knots). Over the Gulf of Mexico winds tend to be more variable but still averaging mostly forces 4-5 (11-21 knots). The risk for gale force or higher winds is low, generally 1 % or less, except for the westernmost Gulf of Mexico where the gale risk is 2-3%.
Strong to near gale conditions, can occur so the risk of encountering rough 8 foot or higher seas is about 10% over the Gulf of Mexico and ranges from 10 to 30 percent over the central and western Caribbean with the highest risk concentrated north of the Colombian coast. The eastern Caribbean tends to have less risk for rough seas, occurring less than 10% of the time and winds averaging force 4 (11-16 knots).
Air temperatures during December average 27C-28C (80-83 F) across the Caribbean, 16C-22C (61-72 F) over the northern and western Gulf of Mexico and 22-25C (72-77 F) across the Bay of Campeche and southern Gulf of Mexico. Sea surface temperatures range from 26-28C (79-82 F) in the Caribbean, 18-24C (64-75 F) over the northern and western Gulf of Mexico and 24-27C (75-81 F) in the Bay of Campeche and southeastern Gulf of Mexico.