The difference we have noticed between May & December is that May is a bit more humid and warmer at night. There was one year we were at CN during May and there was not a breeze. We were talking with some friends after dinner and I suddenly announced that I had to go swimming and cool off. Went to the room, changed clothes, and jumped in the pool. Cooled me right off. This was the only time that we have been to Jamaica (6x) and I've been hot at night. Other than that, there really wasn't a difference, but May is the beginning of the rainy season.
Juliann & Jeff
Jamaica Soon Come