Scott Christian
Hero
Turn the thermostat down real low, and if it is winter weather, open all the windows. Then, once the game starts, heat the place up. Serve hot tea, coffee, or cocoa (spiked if needed) for extra points.
I can only add two things to the great advice above:

I can only add two things to the great advice above:
- If you create extra rules, do not have the rules remove the character from play. Exhaustion and disadvantage are enough. And most players, at least in their head, feel that if a yeti was boring down on them, their fingers would work normally because of adrenaline. (They wouldn't, but the thought is there.)
- Describe small events with great detail. Wide spaces sparsely. Jack London is good for this. To Build a Fire is superb. The harsh landscape gets a paragraph. Trying to strike a match gets four paragraphs. The point is, make little events that keep the PCs warm or gets them cold, little stories. You won't need a lot to get your point across.