Sandy C has is about right. Nov through Jan we get the cold fronts sweeping through. can bring great 20-25kn sideshore conditions or not very much. The last couple of years have been good. The most consistant time for wind is Feb through May when the trades and thermals start to kick in more although the wind isn't generally as strong only 12-20knots and more onshore. For the last couple of years June has been great with daily 15plus winds.
hope this helps if you need any more info contact me on [email protected]
Chris- sailsports belize.