Cdnwolf Swaghauler and Unkatedif I was browsing through this and I figured that if you would like a pretty good approximation of projectile behavior at altitude and extreme cold you can use my Excel spread sheet.
If you search for my topic Real Life Small Arms and download the file. On the Ballistics Table tab in cells A14 and A15 there is Altitude and Temperature. You can get a general trend of what the climate will do by imputing a few weapons. I have found Wikipedia to be a pretty good resource for such things.
Just my 2 cents (and a plug)
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