I have carried guns in the desert, mountains, jungle, plains and forest... I have never seen a gun that didn't fire based on temperature... I have read about it, but apparently that had to do with the oil being used for lube freezing into a paste.. Most guns of any quality will take conditions that would kill the owner long before it destroys the guns reliability.
The German army in WWII supposedly added gasoline to the oils they were using and that stopped the problem..