In extreme cold butane can become unable to turn into a gaseous state.This makes it unable to light.I have witnessed this myself.I had the pleasure <img src="images/graemlins/smirk.gif" alt="" />of spending almost a month above the Arctic circle.This was compliments of U.S.Navy.In very damp conditions(rain forests,monsoons)even life boat matches have difficulty.Metal flint bars can create sparks hotter than matches.As for their size and weight they can start more fires than matches you could carry comfortably.So if with practice you learn to start a fire with just a spark you can handle most any thing.Also welcome to the forum.
BOATMAN