I can help you with Florida, as a state.
Florida is the 22nd largest state. It a wide variety of locations to explore.
Monthly campground rates vary from about $350.00 per month to over $2,500.00 depending on location and amenities.
In general, the further south and the closer to either ocean (Atlantic or Gulf) you get, the more expensive the site rental.
I-4 which runs basically east-west across the state is generally accepted as the "frost line" south of that, frost is a rear occurrence in winter.
Florida just had the highest visitation rate in years. It was very busy this winter, so make you reservations early.
Hope this helps in your search.