Are canister stoves safe to use in cold weather?

Standard isobutane/propane canisters lose pressure below freezing, and butane-only stoves struggle even sooner. Reviewers across specialist subreddits flag this consistently. Stoves with pressure regulators (the SOTO WindMaster and newer regulated Jetboils) hold output more steadily as the canister depletes and chills, but no upright canister stove is ideal for deep winter or high-altitude snow melting without an inverted-canister or liquid-fuel setup.