At the end of the last story arc of my campaign, the party managed to get all their tax money back by killing their corrupt lord, only to have it stolen by a young dragon who would be a difficult (but not impossible) encounter at this point.
Winter is coming, and I would like the characters to have a break from having their money stolen so they can buy stuff (generous, I know). Are dragons known to hibernate during the winter? Are they known to migrate? How else might winter affect the dragon?