I have used a MSR Pocket Rocket stove down to about -10C with no problems. The secret as others have posted is to keep the cannister warm. Also when using the stove, keep the cannister directly off the cold ground. I use a small piece of Polar fleece for this which is also big enough to wrap around the fuel cannister. A windscreen also helps (as with almost any stove.)
I have a Primus clip on windscreen and it fits great on pocket rocket, and take almost no additional space when inverted on a fuel canister.
If you might have to stay out all night it is THAT remote.
Having spent nights in that kind of weather without a full camp, I would want at least shelter and additional insulation (I often carried an elephant foot bag and my parka). Less than that can mean a very uncomfortable night!
Respectfully,
Jerry
Everything add together is just a bit too much to carry for "just in case" though, at least for now. Up here there are tons of evergreen trees, I'm sure I could rig something up if it comes down to that, always have a knife and saw on me when I'm outdoors.
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