I quite like summer, but not if it's humid, or over 75-85F. In Denmark, it's unusual that anyone has AC, so especially at night is it a pain if it's over 75F. I'm lucky I can keep the windows open - Fister won't jump out, but I usually keep the blinds down all day and the curtains drawed in my bedroom, when it's hot.

I remember when I visited CA... it was 88F one day, but when you get 5 miles inland, it was 10 degrees hotter. Spain also has a nice warm and dry climate. In Denmark we have a coastline almost anywhere you go, so that helps, too.