@@beccafries These were a few websites that I used before picking a date.
http://traveltips.usatoday.com/time-vacation-cancun-12434.html
http://www.smartertravel.com/travel-guides/page.php?id=2306221
http://www.besttimetogo.com/visit/Mexico/Cancun (Average Monthly Temperature and Rainfall in Cancun)
http://www.beachweddingplanning.com/cancun.html
Hurricane season has the lowest prices and there might be a hurricane or there might not be one. The locals say it is the best time to go because there is less tourists. With all that said, we went with late January because of low humidity and right temperatures
Happy Planning,
Kristen.