Yeah there's nothing like cold fingers on ultra thin FastFlight... yowch. Piano wire!
I don't think cold muscles help either, but John touched on what I think is the most important point - lack of practice! With the winter here, it's either raining too much or land owners aren't too keen on getting up early to let you use certain fields etc, and while a week or two with no practice is one thing, as it adds up it becomes really tough. That's my excuse, anyway...