One of the big problems with winter survival is starting a fire in a cold wet windy environment. Carrying a bic lighter and some vaseline coated cotton balls may not be enough. You might want to tuck a road flare and/or a small can of zippo fuel in your pack for that ultimate wet wood fire starting capability. Might save your life if you suddenly find yourself soaking wet.
+1. I like to think I'm pretty handy with firecraft but winter here is challenging. We can get extended sub-zero temps. Humidity isn't usually an issue but of course we get cold and wet, too. I've been keeping some vacuum sealed Esbit/Hexamine tabs for emergencies...once it gets bad out I'll test them in the wet & cold.