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You lose much more water in the winter than you think.
Winter air can be very dry, and the cool air wicks sweat away from you so quickly that you are often not even aware you are sweating. Second, you need to drink more than you think because inadequate hydration contributes to both altitude sickness and to hypothermia. Start your day of winter hiking with a bottle of hot liquid shielded inside an insulated carrier: this will be more appealing to drink than ice-cold water.