Cold isn't usually a problem, it is the humidity which can allow water to run in and freeze onto the seals. Icing troubles usually occur at or just below freezing. As the air gets colder it won't hold so much water so really cold climates are not a problem.
A very thin smear of silicone grease (or silicone furniture polish) will help to stop ice sticking the rubber seals together in the winter. Take time over this, there are many small contact areas and don't forget the ones on the door, especially the big one at the bottom of the door which can easily be missed.
Do not put too much on - wipe it off with your finger after applying or it will attract dust and dirt - or get on your clothes!
Do not use ordinary grease or Vaseline as these are petroleum-based and may attack the rubber in the seals