I love these ideas. They could become skill challenges.Cold
- the weather becomes a huge factor in true arctic campaigns and is often far more dangerous than any monster. When night falls the wind chill alone makes getting rest near impossible without the PCs having really good shelter. The cold kills, but also remember that areas of melt can result in boggy ground and icy water that acts as a trap to the unwary.
Snow drifts also make the ground soft and difficult to walk on, leading to greater likelihood of falls.
Then of course there is the dreaded blizzard, the whiteout and the rush of the avalanche.