Been in FL all my life. Jan, Feb, and early March can be cold if you hit a front. Worst case would be like 30 overnight with highs in the upper 40's or 50's. They usually blow through in 1-3 days. We love the parks that time of year.
Yeah I live in Florida as well but in the panhandle. We can get cold (by Floridian standards lol) but I figured down there it's not as bad.
The "math" is usually somewhere around 10 days. So 2 trips inside the 52 weeks would prob pay off. Wait to buy and watch for the 13th month free if they do it again this year. We are AP's - if you get a pass remember to use the discounts for everything, they do add up.