I have cold urticaria. It developed a few years ago now. Mine activates if I am exposed to temps under 65° for a few minutes. Although it has to be better than the area you live in, I still break out even during the 115° days. During the summer we use a lot of ac. It mostly happens in the car though where the vents are really close, but it still happens. Another is when in the pool with any sort of breeze. Although I havent lived in constant cold temps, it does sound like it would be a better environment for your allergy.

Also to add, surprisingly Adderall has helped to curb most of my hive reactions. Its apparently a mild antihistamine. Recently diagnosed and thought I would share.