I keep the batteries warm as Duncan suggests, but let the camera stay cool/cold in the camera bag. The main worry is condensation forming inside the body and then freezing. I have had this happen to an old praktica body and destroy the shutter curtain.
The best way to avoid the moisture problems is to avoid rapid temperature change. So, when moving from hot to cold or visa versa, let the kit acclimatise slowly before getting it out.
Mind you Mongolia is cold and dry rather than cold and wet, so it may be less of a problem than in the North of England!
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