What do characters do, in weather like this? Hunker down and pray? Dive out into the chill to enjoy it? Go “Eh,” wave a hand, and have a personal Spring following them around?
(I’m kind of with the hunkering; I hate being cold. Hate it.)
Each of these options imply different things about both the world of the book and the characters themselves. What the climate’s like. What the level of tech and power available to a particular character is. Going out into the snow when you’ve got hot cocoa waiting back home? Annoying. Going out when you’re coming back to a shack with no firewood? Life-threatening. Going out when you can melt the entire mountain slope with a wave of your hand?
…That might be life-threatening too, eventually. Given the locals might arrest you for the crime of being Lina Inverse.
(Okay, probably not that exactly. But your character might have the dastardly nicknames of Causer of Avalanches, Harbinger of Winter Floods, and all-around Enemy to All Yeti-Kind.)
(That’s assuming skiers don’t descend on the character in one brightly-colored insulted swarm. But eh, if you can do avalanches, skiers are probably a walk in the park….)
Long story short, a character’s reaction to wintry conditions, or any other potentially dangerous environmental hazard, can let you say a lot about both how much power someone in your setting has, and whether or not they’re willing to use it, regardless of consequences.
So what’s your character willing to do for that cup of cocoa?