having spent a considerable amount of time in the woods most of my life, I consider myself a pretty good fire starter regardless of the conditions...BUT...a couple of seasons ago I attempted to start a fire when the conditions were WET after a driving snow storm (just practice, non emergency) and even the normally dry/dead tender at the base of Fir/Hemlock trees was coated with a layer of ice/snow.
here's what I learned...there are conditions where building a fire is next to impossible...period. The amount of energy and effort it would have taken to gather enough fuel for a fire that day would have been monumental. There are probably those who will read this and scoff, and good for you...but in a true emergency situation, I want to expend as little energy as possible to survive as long as I can.
After that, I went home and did a little experiment. Took a soup can, filled with fuel, and lit it on fire like a candle. Set the timer and waited. It burned for over 3 hours!!
I now carry a siphon tube (with the one way check valve so no sucking) and a Progresso soup can (large opening and stainless).
With this, 2-3 fill-ups will burn all night with NO need to collect firewood and keep it burning. I can use branches to keep me off the snow, my survival tarp, and bivy sac, and have a heat/fire source with little/no effort.