If I hadn't lived in Iceland for 2 years, the claim that the episode was shot in winter would have escaped me. However, there is no daylight between Thanksgiving and Easter at that latitude.
Notwithstanding that fact, I have waded glacial rivers and bathed in thermal streams, as well as having worked on a commercial fishing boat in the dead of winter on the artic circle, and had empathy for what he was experiencing. I apparently enjoyed sheeps eyeballs more than Bear.