Winters in south GA or northern FL are certainly far milder than any we ever experienced in Wisconsin, but there are too many "long pants and shoes" days for my taste.
There's a reason rates in the Florida panhandle drop considerably over the winter. If you don't mind frequent days with highs only in the 60's, there are a number of beautiful parks along the gulf coast.
For the best chance of shorts and sandals weather, for most of the winter, we generally suggest folks look no further north of the I-4 corridor in Florida. We stay right on that line, just south of Orlando. Many, if not most, morning temps in northwest Florida will be 10 to 15 degrees colder than we are.
Jay & Peggy Monroe with Dolly
Can't take it with you - don't plan on leaving any behind
2016 Newmar London Aire 4553, Spartan chassis
Wrangler Unlimited toad