December Weather San Pedro Ambergris Caye Belize
The month of December is characterized by essentially constant daily high temperatures, with daily highs around 82°F throughout the month, exceeding 86°F or dropping below 77°F only one day in ten.
Over the course of December typical wind speeds vary from 0 mph to 12 mph (calm to gentle breeze), rarely exceeding 16 mph (moderate breeze).

Belize’s high season for tourism is from November to May. This time period runs simultaneously with the dry season, which is the best time for weather in Belize. Coincidentally, this point in time also matches with the great white north’s winter which means lots of Americans and Canadians escape the cold searching for warmer climate.
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The Dive Shops Daily Blog
http://scubalessonsbelize.blogspot.com/