Lee,
Here in North -Central Florida, you could expect rates for the peak season (November - April) run about $400 per month. That's paying for 6 months, in advance. You need to get reservations early or most CG's be booked in early spring for the following season. It can be difficult and more expensive to get in to places on a shorter-term.
That does not include electric. It still is plenty cold enough to need heat. Electric (and propane) are expensive here. We pay about $0.20 per Kilowatt/hour, and about $28 for a 30# propane tank. We rely more heavily on the electric fireplace and space heaters, and use the furnace to trim things out. I would guess our monthly utility costs (Dec/Jan/Feb) to average $175 for electric and another $75 for propane. Internet is another $35 per month. Evenings are 35-45 degrees, with daytime highs of 65 to 75 degrees.
Most campgrounds offer amenities, activities, and plenty of friends to make with similar interests, backgrounds, and ages.