I'm looking forward to imaging Orion's treats too, after filling my boots with the wonders of the centre of the Galaxy this winter.
Coldest I observed in was -25C in Scotland and you wanted to get in to the fire asap even if the sky was breathtakingly clear. -10C evenings were quite regular in Highland winters ... where Orion was a favourite target! The first task might be to make a flat patch in the snow, then the battle was with frost rather than simply dew. But I'd take -25C over meeting any of the nasty snakes hereabouts
Weird as it is (for me) seeing Orion in summer, it is quite fun to look at it in shorts and T-shirt...