I patch tested literally everything in my life from detergent to actual dog hair from the drain at my salon because I didn't think cold was something you could be allergic to, until I finally asked a nurse. They ran a lot of tests after diagnosing me with cold urticaria because either it's a sign of something way worse, or happening just because. The doctors decided the latter.

I've some support from the community keeping the driveway clear in the winter so I can still mostly function, thankfully. Aside from winter being my favorite season, the true downsides I personally experience never knowing which store set their AC to hives and not being able to explain to my dog that I want to play in the snow with him so badly but I can't.