Cat5 Cable and Cold weather?
Cold, dry weather is one of the reasons you should NEVER put copper outdoors without entrance protection.
The wind + snow & blowing particulates generate a static charge on the cable which can kill your systems.
As mentioned in the past, Category-rated cable is (with one or two exceptions) not certified for outdoor use. Improper installation of copper cabling in an outdoor environment is dangerous.
As you may have figured out, I advise against it in the strongest of terms.
Maybe Santa will bring you a wireless system.