The window (in my case) comes in contact with the weather striping along the roof (top part of the door frame)... in cold weather the weather stripping isn't as pliable. So the window gets caught on the almost rock hard rubber. And are cabins are almost air tight... sometimes even in summer if you slam the door it wont close all the way.

Fix: Well, the window is about 1/2 millimeter to tall... if our roll it done about that much you shouldn't have a problem. It's worked for me for nearly 3 yrs now.