I have found that a few drops of lighter fluid (naptha) in the carb venturi does wonders for getting glow engines to start when the temps drop. Before discovering that trick, I nearly resorted to buying an electric starter just for cold weather use.
Cold affects electrics also. Lipos like to be at about 90 to 100 degrees for maximum performance. Keep them in a warm place until ready to fly and tape up some of the vent holes in the fuselage.