Those are great ideas. Thank you! I will definitely use the plastic back and desiccant ideas when coming in from the cold. The industry I currently work in rates electronic devices at -40C to 85C, so I was surprised to see the narrow range for DSLRs. Of course, we don't need to worry about oil and condensation on lenses....
Thanks again!

I am new to the forum, and contemplating either the Canon 6d or Nikon d610, and noticed that the both have temperature ranges from 32F to 104F. I'm sure I will be shooting outside of that range. Any experience shooting in hot and cold environments outside the published ranges of the cameras?