McFarland Park in Florence, Alabama. Full hookups, about $20 per night, right next to the Tennessee River. It's 10 minutes from downtown Florence with several nice restaurants. The campground is well protected and no non campers allowed in or out after 10 P.M. Barge traffic going by, heading to and from the Wilson Dam, which, at one point, had the highest single lift lock in the world.
Florence is part of the Muscle Shoals area, home of FAME music studios, and museum. Several famous artists made their music there.
Of course, temperature is never a guarantee anywhere but the highs average 53 and the lows 34 in December.