I like using climate charts when planning the time frame for a trip. I've found these two for Belize.

http://www.selectlatinamerica.co.uk/destinations/belize/climate

http://www.journeylatinamerica.co.uk/jlaselect/vichouse/climate.htm

If anyone knows of a source of such information specifically for Ambergris Caye, I'd appreciate the information. Thanks.

Oops -- I put this on the wrong part of the board. I'll move it to the general question section.