Generally, you would want to be south of Orlando. Then the farther south, the warmer.
This is pretty good advice, if you will be wintering in an RV. We started spending a good chunk of winter in Florida (St Augustine: VERY, VERY cold the past 2 winters!).....but in a condo (with a 40,000 btu heat pump!). We drove into the interior to the Ocala region to check it out this winter (and past winters), and I gotta tell you, unless you want to burn the RV furnace from early eveing till about 10 AM every day from mid December to 1st week of March, you'd better look a good deal south of Orlando.
The Panhandle is very, very cold over winter; it is not uncommon to have occasional snows up there (forget about regular temps in the 30sF and even in the 20sF mid December, Jan, Feb, and mid March).
Good luck,
S-
