Hello MN! It's often COLD in WDW in January -- even for Nebraskans.

The weather has a real range to it. It can be in the low 70's during mid day to the low 20's at night.
We have been at WDW the first full week of January for the last two years. (marathon time) Both trips have included at least one day where it was warmer in NE than at WDW.
We take summer and winter clothes (including winter coats) and wear both.
This last trip I didn't want to wear my heavy gloves and I bought a $6 lightweight pair of MM gloves in MGM. They were perfect.
Usually a spring jacket and long pants are needed during the day.
Riding on SM or Kali RR can be VERY if-y at best. If you want to ride them, you almost have to plan your days around the weather.
Winters coats may be wanted if you are camped out on the cold cement waiting for fireworks or Illuminations.
I even like layering (top, sweatshirt, jacket) and storing what I don't need at that time in a locker.
The park hours are shorter, but there are no crowds.
