The reverse of a meme I made when it started getting cold...

The UK. In my part the average temperature in June, July and August is 14C (57F). Being an average it can obviously be colder so you need a thin coat similar to the picture.

This is probably an urban myth. There's a story about a Japanese guy at The Open golf in July - probably St Andrews. With the rain hammering down he turns to the guy next to him and says "Why don't they hold it in summer?"

Many years ago, I was in SF in late June. Fell asleep with the window open and woke up with strep throat in what felt like a meat locker. But I've also been there in January with temperatures in the mid 50's.

England. Seriously, I'm from there, it's true; people have Summer coats.