CLKD,
Stephen does get a little more wound up when he's very hot, but otherwise the weather doesn't affect him too much. Like. most people, cold causes aches and pains. I just have to make sure he's warm enough, but not overly warm.
I don't know if the OU does a textile course which might encompass plain sewing. What are you looking to do? Our local WEA does dressmaking classes and I think our local education authority has something similar.
Hope this helps.
Carole