TwoGuns fired this volley in news:5abee347-16d5-
:

The only problem with Butane or Propane is in extremely cold weather
they will freeze up.
The both will freeze themselves up if the demand is too high, so the tank
boils.

Propane starts to wimp out at about 0F, although it's useful well below
that.

For butane I don't know the specs, but I have a butane palm torch that
will not yeild a useful flame below about 20F, and it sounds like
"nothing there" when you open the valve.

LLoyd