ORIGINAL: mscic-RCU
A cold weather trick I've used is to put the cylinder in the exhaust pipe of your car if it is accessible. Otherwise, warm it up in your car. I guess you could wrap one of those chemical hand warmers around the cylinder.
The chemical hand warms work great. go for the foot ones if there left open to air they get much warmer without having to shack it forever wrap it aroun the cylider when not flying they last about 6 hourse so ecpect to use one everytime you go when y ou want to fly just remove from engine trow in/ontop of field bax start ingine and go when you land trow it back on the cylinder... works great and your not always trying to shove the cylinder in your tail pipe