I find it difficult to drink enough water during winter. I have to remind myself to drink. I use an empty Gatorade bottle filled with water on the kitchen counter to remind me to drink and refill it so I can sort of keep track if I am drinking enough. And, yes, I have heard that before about hydration and cold weather. I've never paid much attention to it as I have always been more concerned with simply staying hydrated because during winter, the cold seems to cool me off even when I am active and I simply don't drink as much even when I should so...but I expect he is correct.
