I am moving to Louisiana, from Wisconsin, and will report about whether or not weather makes a difference in my Behcet's Disease. It does seem that winter and cold affects me greatly, so Wisconsin is not the place to be, although interestingly enough, this is a disease that commonly strikes middle easterners and Japanese in increased numbers.
It makes sense that a disease that attacks the vascular system would be that much worse in cold climates. Here's hoping. Louisiana promises to be a much milder climate temperature wise than Wisconsin.