I read about other people with the same problem and I'll tell you the same thing I told them. Read this thoroughly and if you can't figure out the cause bring it to the dealer if it continues.

Moisture is caused by WARM air. Warm air can hold moisture. Cold air CANNOT. Thus it's humid when it's warm out because the air is holding moisture.. When it's winter and cold, the air is NOT holding moisture... it's dry.

Now here's what's probably happening. With the windows up, our car is pretty much airtight. If you turn off the car when the inside is all hot (and holding moisture), and then the temperature outside dips down and gets cold, the air inside your car will get cold. The air can't hold the moisture any more so it forms into water on your windows (where its coldest, thus holding the least moisture and making the water solid) The problem will be even worse if you get in the car with wet clothes or shoes, it will evaporate into the air and then remain there until temperatures come down and then it will form mist or water on the windows. Are any of these scenario's happening to you?

-Try blowing your AC or rolling down the windows for a minute prior to putting the car away.

-Try turning down the heat when your in the car.

-Try wiping off the vapor while the car is cold and see if it reforms the next day. I have a feeling that since it's cold out, your probably driving around with the heat blasting and thus it's holding the water. **Even if the mist on your windows eventually evaporates as you drive the car, unless you roll down the windows and let the warm air blow out, the air will remain inside the car and redistribute itself as mist when it gets cold out again! I have a feeling this is what's happening. Just because you can't see the moisture doesn't mean it's not there!

Anyway I hope these tips helped!