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I was there in Jan/Feb 2012. 'Be Prepared' for temperatures averaging from +30 to -30 degrees. Staying dry in the High Winter Desert is not usually a problem as long as you don't over heat.
Warm boots with wool knee socks & very light socks underneath to reduce friction & wick moisture away from the skin. I have lightly insulated hunting boots that lace up to just below my knees to keep the elements out.
At the minimum, a union suit with a windproof nylon jacket & ski warm up pants over it sufficed on the warmer days. In cold/windy/nasty weather, an additional layer of Polar Tech Fleece between the union suit and the nylon wind barrier works. My Polar Tech Fleece has leg zippers, so I can put it on without taking my boots off. Likewise with my ski warm up pants.
Camera gear has a way of sucking the heat out of your hands. Isotoner gloves with fingerless wool gloves over them keep my fingers toasty warm. That combination allows me to manipulate my camera controls without taking my gloves off. A warm stocking cap, or even a balaclava with a face mask, wouldn't be a bad idea either.
Even if you're not wearing it, always carry your coldest weather gear with you in a small day pack.
Don't forget to bring Sunglasses! Polarized if you have them.