The worst is going to Kuwait during the late Spring early Summer months. The exact second you step off the plane is like getting hit by that industrial strength hairdryer from Spaceballs. You literally can't breath for a second. You get used to it pretty quick though, especially if you don't really have air conditioning.
I've experienced that sensation a couple of times. Mostly in France, after shopping in an air conditioned mall and then stepping out onto the parking lot, but I've also tried it when I flew to Tunisia and Turkey. In the former case, we were dumped straight onto the airstrip from the plane, because terminals are overrated, or whatever, and we had to keep moving to prevent the soles on our boots from melting to the ground.
Out of curiosity, are your roads made of concrete or tarmac?
We use tarmac for everything, but it starts to melt as soon as the temperature gets above normal. I can only imagine what it would do to tarmac roads in your countries where the temperature is crazy all the time. I've noticed that southern countries tend to use concrete (or something similar) instead, probably because it doesn't melt like tarmac. It just cracks instead, especially in the countries with large temperature swings, like in the Alps.
The worst part of warm weather is when you go to sleep and you're still sweating. I'm not the kind of person who needs sub-zero temperatures to sleep (my parents are), but when I'm sweating, I just can't fall asleep. Edited, Jul 8th 2013 6:53pm by Mazra