LiPos are affected by the cold.

I cannot give you any specific data, though. In freezing temps (down to about -10C), I've only flown R/C parkfliers. My procedure was to keep the LiPo in a warm place until I plugged it in just before flight. I also restricted airflow by taping over the intake which also helped keep the snow on the outside.

You might want to experiment a bit: flying without putting the airplane in too risky attitudes.

A good "warm place" is a shirt, pants, or inner coat pocket.

Just check there's nothing in the pocket that COULD short the pack 

Paul,
I use a metal ammo case with vertical separator's to hold the batteries, a side benefit is that the case can be set in the sun and it warms quickly. I have also slipped hand warmer packs inside the case. Although it doesn't get to cold here in FL at times for the King Orange it has dropped into the upper 30's which will reduce capacity. On my profile ship I have put a foil rap around the pack since they hang in the breeze. I also like to keep the case inside the warm car or building until it's time to fly.

Best,           DennisT

A "Little Igloo" cooler will also act as a good heater. I warm "cold/heat" packs in the microwave and put them in with the batteries. I think I got packs from Walgreens when I had knee surgery.

Even the same energy in cold day with frozen battery with higher internal resistence and thus lower voltage means higher consumption of mAh :- )))