I flew at similar temperatures, and it happened to me that the phone gave me the message "temperature too low to charge the battery", but this was a telephone warning. clearly taking off and landing on the hand. No problem with the drone. One day I left the battery on the drone and I had the message "battery temperature too low". In that case I had to put a hotter (which I had in the jacket) otherwise it did not even start the engines. Apart from keeping the batteries warm, and then unloading them a little, winter flights can be done.