It's all been said, except for one thing: don't get discouraged!

It's certainly true that cold weather hurts gas mileage, and your hybrid won't perform like it did in the desert now that you're in Alaska. However- the big thing to remember is that it hurts EVERY car's gas mileage, not just hybrids, and the drop is fairly proportionate to the usual FE. The hit might be 10%, it might be 15% or 20%-- whatever it is, a percentage of fuel efficiency for a hybrid will mean a bigger drop in absolute number of miles per gallon than for a very inefficient car, which means you notice it a bit more if you keep track of fuel efficiency.

Do not let this discourage you! Getting 22 mpg on short trips in cold weather is a heck of a lot better than getting 15 mpg, or 10, which is probably where the non-hybrid SUVs in your area will be at for similar trips. By all means, look for tips and try to find a way to improve your FE, but remember: Fuel efficiency is relative. Comparing hill driving in chilly Alaska to coasting over flat plains in a desert is only going be frustrating, because it isn't an apples-to-apples comparison.

Good luck!