I also have small fiber full body. I'm in lower NY so we get 4 good seasons here. I have found I feel somewhat better in the summers, but it may be more psychological.

During the summer, I'm out and about trying to keep active and have more frequent periods when my symptoms are not front and center in my mind.
In the winter while often homebound a good deal of the time, I have much more time to notice my disturbing symptoms. I think that can exacerbate them.

I also have become much more sensitive to extreme temperatures, but specially the cold. My hands become painful very quickly when it's cold out. And my skin has gotten so dry in the last year it looks like I aged 20 years in the last 12 months. So living in a dry heated house in the winter is the worse for me. I definitely prefer any season over winter.