Jim,
I live in North Yorkshire, England. Up here were on a longitude slightly
north of Goose Bay, Canada, and it gets pretty cold up on the moors.
I friend of mine who was a member of the mountain rescue once gave me a
tip. If your LPG won't light because it's too cold, try putting the
cylinder between your legs and cuddling it for ten minutes to warm it up
a bit. Might not be the first thing you'd want to try on a freezing cold
morning, but it would be a good way to test if it's just the cold
affecting your gas.
Cheers,
Stew.