I'm not in Florida, so can't say what your tropical weather would do. In the midwest, I buy by the bag and pour it in a pet food container with a gasketed lid. Each container holds about a half of a bag of grain. I store the containers on a shelf in the garage, where I grind my grain, away from my fermentation and storage area in the basement.
The container I use is this one http://www.amazon.com/Pureness-25-Po...food+container