Don't forget the ice cream!
The first time I experienced 100+ degrees, my brain fried and I forgot both to take a cold shower and to check the freezer. The fan was blowing as hard as it would go, but it was like a hot wind.
Another time I walked outside in 117 degrees and it actually hurt to be in the sun. What was weird was that in a swimming pool you didn't even notice it was hot.
Once experienced 120+ degrees driving through a desert, which was just ridiculous. Fortunately, I only got out for a pitstop. Otherwise AC.
Britain has countrywide air conditioning, also known as the Atlantic Ocean. I am better suited to a northern island climate.