I live in Flagstaff, AZ, where it gets freezing cold in the winter and is very arid (single-digit humidity numbers aren't unusual).
I was given a tube of this (way back when it was a promo and still green!) and it's the best thing ever. Now that it's readily available, I have one in the truck, one in my backpack, and a couple more hanging around the house.
It keeps me un-cracked like no other. Accept no substitutes!