I too live in Western PA (Pittsburgh) and noticed my symptoms are much worse in the winter as well. I always attributed that to lack of sunshine and not being able to go outside for nature hikes and what not, but the cold whether definitely causes me to tense up more and makes me more uncomfortable which can definitely worsen my symptoms.

I also notice that no matter what supplements I take or don't take, my symptoms usually are the worse on Mondays and Tuesdays as well. I find this very odd, and used to blame it on work (I have a stressful job as a cook Thurs-Sun) but when I was off for 2 months because of a kitchen fire my symptoms were still always worst on Mondays and Tuesdays.

Wierd. Looks like we should move south.