I live about 3 hours north and used to live slightly less than 2 hours north of there (in Jacksonville). We had A winter (in 1989, I can remember b/c it is so rare) that we had snow 3 days before Xmas. That was a VERY rare thing.
Normally? We are in shorts and Tshirts at both Thanksgiving AND Christmas. The evenings after dusk and early in the morning (before 10 a.m.) you might want long pants and a light jacket (nothing heavy weight--no snow gear type stuff) as a general rule. I would check the weather forecasts for the week you plan to be down there just a couple of days before you go, so you have a more accurate expectation. 2 winters ago was the coldest we have had in A WHILE. And it was COLD (by our standards--- dropped below freezing something like 15 days in a row... I think the lowest was around 12 degrees?--but this is 3 hours north, too). Daytime highs, during that coldest time were in the high 40's or low 50s. That was a very unusual winter, though.
It COULD be like that again, but it isn't shaping up that way so far.
Today, where I am (just barely north of the Florida state line) the high was 72 degrees. It has been in the mid-high 80s for the past few days before this though. I'm not expecting a cold winter this year.