Campingdad

We've thought about upgrading to a small diesel pusher in a couple of years after Rene retires. Normally we would buy new but are considering used. I expect to see fair number of 2 and 3 year old models with low mileage on the market for a decent discount after folks discover how much it costs in time and money to keep up an RV.

I think some of the TAs have a large amount of staff members that all start booking sites as soon as they open.
 
So they do scoop up a bunch of reservations as soon as they can.
 
I'm sure if Jason can get that lazy cat of his trained to use a PC, he could book more sites... 

It will be those who bought and then decided to get out after COVID and didn't do their homework when they bought. They figured they could sell it for what they owed not realizing the RV market doesn't work that way.  

I've been in early January, not camping, but staying on property.   Temperatures can range from the 40's to the 80's, but the standard is in the 60's and 70's.   Too early in the year for the every afternoon rain shower, spring storms or hurricanes, so unless you just get bad luck, you shouldn't have to worry about too much rain.  Keep your poncho's handy, though.
Cold fronts have been known to push down that far south, so if you have really bad luck, it may get to freezing. 
Crowds are usually pretty low,  the Christmas/NY crowds have gone home, everyone is broke from the holidays, kids are in school and the MLK day crowds aren't there yet.   One of my favorite times to visit, because of that.
Make sure you check for what is expected to be under refurbishment.  January is prime time for rides to be worked on, so some of your favorites may not be available.  At least one water park will be closed for refurb.  They used to switch out TL and BB each year, but I don't know if the pandemic interrupted the schedule.

(Context: I've lived my entire life in New England, the last 30 years in southern NH)
Temp ranges can swing about a bit as already noted, and in my experience, when it's "cold" in FL, it's a damp cold, which affects me a lot more than our icy, dry cold up this way. That said, I've tent camped at the Fort in January and gone from needing the electric heater and an extra fleece blanket inside my sleeping bag on the first night, to sleeping with just a sheet and the fan blowing 3 nights later. So... anything goes!
Layers are your friend, and if you're not from cold places (like here in NH) pack warm hats, mittens and socks, just in case.
Personally I love FL in January, but then NH in January.... 
Crowd-wide WDW in January is nice, with the exception of MLK weekend which tends to be busy-ish.

When our kids were young we would go to WDW when they were tracked out in January. We found the daytime temps tended to run from the low 60's to low 80's. I don't think we saw anything much below the mid-50's at night. What we would wear here in NC for winter clothing was more than adequate for anything Florida could throw at us cold wise. We also packed summer clothes for the more typical daytime temps in the 70's.
I can't speak to crowds these days but in the 90's and early 2000's January was a good time as it was in between US school vacation times and Brazilian youth groups.

Yeah as a local who camps at the Fort frequently we have learned recently that we need to book all the trips we want for the entire year as soon as we can. Worse case scenario we cancel the trips we decide not to take (which never happens ) however we learned many others do the same thing with some of them canceling. Plus there are several “travel agents “ (quotes intentional ) who book up sites as soon as they become available .. it’s crazy .. we learned that recently with how at 499 days out Halloween week in 2020 was booked up in seconds . Very frustrating and disappointing 

Possible you hit the very tail end of some of the longer refurbs, but in general they should be wrapping everything up to have it ready to go for peak season, which usually starts Pres. Day weekend.

I have nothing of value to add, just wanted to say hi from a fellow Eastern Shore person!
 
Hello from Preston!

And don't forget the Great Movie Ride!

My sources tell me that 20,000k leagues, the Skyway, and Mr Toad will definitely be down then.  

According to the current Disney TA refurb calendar nothing is showing on it for any park in 2019. Will things get added, probably. Then tend to do refurbs in the "slower season". Often Splash is down for maintenance and one of the water parks. Beyond that I think it is too early to tell. 

I would be amazed if Disney had that level of organization or even has access to that information.  Actual Police Agencies have to jump thru hoops to get and keep access to State and Federal Firearms databases. Any abuse of that access is a Federal Offense and can get your entire Dept kicked off the net.
And don't forget that this is the same outfit that can't train it's Security Guards to give the same answer twice let alone enforce rules evenly.
I mean, what are they going to do if you say "No" to any of their questions? Are the Security Guards going to bring out the portable Lie Detector?  Are they going to start waving RV's into a TSA type vehicle search?
There's a reason most of us in Law Enforcement call this stuff "Security Theater".....
 
 

You would sure fit in with Pandora though.

we always take two pair of shoes per person so that they can have a day to dry out good.  I also carry a hydration pack that the wife and I share.  this year will be our first trip to the fort so will be there at the same time.

I went last year in the last two weeks of August.  Florida Kids go back to school so it is less crowded with the exception of the pool at the Fort.  Everybody staying at the Fort is in the pool in the after noon.  I hope you like people because it can get a little tight.  While the water is wet, it is not cooling.  I would also suggest that you bring a hat for everyone in your party and wear a cheap T shirt at the pool so you and yours don't look like that guy who glows in the dark when the sun goes down.

When our kids were young we went in August every year.  The heat and humidity were no worse in FL than they were here in NC.  We'd hit the parks early in the mornings, spend the afternoons at the Fort, and go back to the parks after dinner.  Always had a great time.

We are in Maryland and I don't think Florida is any worse than Maryland.  We have been to The Fort many, many times in August.  In fact we were there last year with our 3 grandkids, the oldest is 6 and the youngest is 3.  Here's my tip, enjoy The Fort during the day, swim, etc.  We usually hit the parks about 4 and close them down.  That has always worked for us.  Just relax and enjoy yourselfs.

Pro tip- the in-park Starbucks put out ice water dispensers and cups on hot days. Self service, and no waits. A few quick serve places do the same- like Casey's in the MK.
TCD

I don't know how close Snowhill is to D.C. but the weather in D.C. in July an August is very like here in Florida.  Hot, humid and chance of rain.
 

Years ago we went last week in August (stayed in Pop Century not the Fort) and the heat and humidity was offset by the fact that it wasn't very crowded. That may not be the case anymore.  Also hopefully they still have the policy of you can ask for free cups of ice water at any refreshment place. We did that a good bit. 

Plan for lots of water/gatorade, then double or triple the amount.
Take lots of lightweight t-shirts and double or triple what you think you will need. You can soak thru a shirt at 08:00 just walking from your site to the bus stop. 
Watch out for heavy weight screen printed shirts.  They look great, but they are 2 to 3 times hotter than an un-decorated T. 
Look for wicking shirts.  
No denim!  Wear loose lightweight cotton or synthetic shorts.
Cooling towels or cooling hats.
Sunscreen, and after sun lotion.
Re-fillable bottles for water at the parks.

If you like hot and humid, you'll have a good trip.  If hot and humid makes you sick, you'll probably want to try for a different time of the year.  If this is the only shot you've got...it's hard to pass up Disney, so I would say go...but drink tons of water and plan for down time to rest.

August can be pretty hot and humid and rainy. When we have gone during the summer we hit the parks in the evening and/or morning and hung out around the Fort in the heat of the day. 
If it came down to going in August or not at all I'd go in August. Just be prepared to sweat. Lots of water and sunscreen.

Agreed x2 Jody, and I really really hope you're right and that this is some kind of a sick hoax.