Don't know about snow or ice freezing up the lock, but every time it rains hard I can't open the driver's door with the remote. It just have enough oomph, and will open only with a key. This problem used to be on the passenger side also until (having to replace the window regulator) I greased all the lock mechanism linkage. It was kind of gummy and sticking. After greasing, never had the problem again. I would grease the driver's side also if I could find the darn plastic retainers for the door panel.
Good luck.
