Cold is not the major problem most people believe it to be. I have taken lots of cameras, from manual film to new digitals out to the mountains of Colorado. In Gunnison, the temperatures drop to below -20F (about -30 C) on a frequent basis. My car can't even change gears, I have to park in first gear and let it warm up for a very long time!

There are only two problems that come up, both mentioned. Batteries should be kept fairly warm. I take a few shots and then place the camera under my clothes while looking for more subjects. I also carry a spare battery close to my body, which I've only needed once.

Condensation is the biggest problem with any camera. Put the camera and cards into a plastic zip-lock before entering a warmer area. Let the camera warm up completely before removing it.

Keep track of these two things and you'll be fine.