How far south do you need to go for Christmas

You can't be guaranteed of anything.

Even in South Florida it can get colder than that. It all depends on what the cold fronts are doing at the time.

I'm staying at Ranchero Village, Weslaco Texas about $500 a month includes cable and high speed internet for a very nice slab site that is wide enough to park your RV and vehicle aide by side.
82 yesterday expecting to hit 79 later today and 80 tomorrow. Supposed to hit 49 Sunday before going back up into the 60's

We have been having this exact discussion around the campfire the past week or two. We are trying to figure out where to winter next year. The problem is, if it's below 70 for long, my family gets cranky! BUT we are also tired of wintering in Florida. :)

We think we're going to try southern Texas next year for a spell. And my family wants to spend a month near Disneyland in Anaheim, CA. So we'll see...

jplante4 wrote:
It's a general rule that if you want 70s all winter in Florida you need to be south of I-4.

X2
Texas gets bad weather all the time.
Florida is your best bet. Even if a cold front does glance us the cold temps are only for a few hours at night and then when the sun comes up its back up to the 70's and 80's.

I'm in central Florida where yes we might have a few more cold nights than southern Florida but the day time temps are the same.

You did say Eastern US, right? I snowbird in Sebring Florida, and I can say your best bet is to stay south of I-4 in Florida. We still do get a few cool days and maybe once or twice a winter get frost, but the temperature is usually in the 60's and 70's during the day, with an occasional cooler spell. I'm growing tomatoes and pineapples at my place and so far this winter they are doing fine. Oh wait, I just read "Active 6 year old", most of the campgrounds in that area are "over 55", in that case I'd recommend Fort Wilderness at Disney World.

leggy wrote:
Looking at next year, what would be a safe location for Christmas to have a good chance for moderate temps, 60-70's? Eastern US. Also, any suggestions of campground? Active 6 year old.

Given what the OP stated, I would suggest the Emerald Coast of Florida for the parents to veg out and/or Mount Dora/Leesburg area in Florida for the folks and the little one. Close to Disney an everything else that is Florida.

The closest you can get to a guarantee it's to head for the Keys, 99.5% chance that most of your trip will be in that range. But if you stay through New year's be aware that even the upper keys have seen 30s and 40s several times in the last decade due to polar vortex.