I have flown in the 10-15 degree range. Allow lots of warm up time after starting and use Ronson lighter fluid to prime, it's oily and works well for those of us to fly in that kin'da weather. You are only going to fly less than 5 mins at a time so have a good heat source around.
Do not run the engine too slow or most likley it will cool down and stop.....a glow heater helps a lot.
A bright sunny, windless day with powder is a blast and floats work as well as skis.
Have fun.