Weather Avg in Puerto Limon <http://www.weather.com/outlook/travel/climatology/monthly/CSXX0006>
At the top of the page where it says Enter City or US Zipcode, just type in Cozumel, etc. and get the same thing for them. Basically, the weather stays very much the same temperature in the Carib all year. More rain in some months than others. The "In" season in the Carib/Mexico starts Dec 14.