Canister stoves will always suffer in cold weather. Even the highest quality ones, such as the MSR Reactor that has regulated output (Jetboil also has regulated output stoves), paired with a canister that is high in isobutane, you're still going to have issues in the extreme old, anything under 10 °F. There are ways around that, such as manually heating up the canister with a lighter, using a moulder strip/alpine bomb, putting the canister in water during operation, getting a canister stove that can take an upside down canister, etc. Liquid stoves are going to be much more reliable in cold weather, albeit less convenient.
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