In general, the weather in Orlando in Dec. in warm with highs in the 60's and 70's. Also, Dec. is not a particularly rainy month. However, cold fronts do push down into Florida and can drop the temps significantly. (It won't be hurricane season, so that's not a factor.) For example, we went on a cruise this past Dec. On our embarkation day, it was sunny with temps in the upper 70's. However when we returned, 7 days later, we debarked to a cold wind and 40 degree temps.