It gets so warm here in August, that you'll taxi with your windows open. In the cloudy U.K. weather you won't have that problem
I've only flown in the UK a couple of times, each a nice weather day, but yes, I've heard it gets cloudy there on occasion. Here at home, summer flying can be 90 F days. I'll take a door right off -
and wear my life jacket if I'm flying over water!