Certainly down south there are more hats in winter than ever before. I never go to Manchester though, so it could be different up there.
Back in December there was a week when it hit ten below freezing every night for a week though, and that's been the pattern for the past few winters. As I say, it's still unseasonably and bitterly cold here at the moment.
Of course, up in Newcastle it can be minus ten and they won't even wear coats... but that's because geordies are nutters.