Despite my urge to comment on flying in that cold, I've seen lots of folks post pics of flying off snow and even in snow storms so I'll offer a couple of thoughts;

Your batteries will take a beating, watch the charge state closely on the flight packs. Do not expect them to last as long as when it's warm outside.

Depending on the ambient air temp when you set 'em up, they may need to have the fuel mixture richened up a bit to compensate for the denser air the cold temps will produce.