I like what you have going on for character cooperation and incentives to play around the Secrets, but I'm unsure how the GM is meant to utilize the temperature chart and the nature of threats in the environment. A little more about the scenario would have been nice. However, these are some really interesting ideas!
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Thanks :)
Yeah, unfortunately I had to choose where to extend the details. The GM is free to play with the temperature however they like based on the challenge they want to create. A good rule could be "the longer you stay somewhere, the colder it gets".
In my mind, there would mostly be huge temperature changes between insides and outsides.