Holy crap it's hot!

[TerryRitchie]

Living in Las Vegas and experiencing 117°F really changed the way I view heat. If it's under 100°F, not so bad as long as you're got some shade! Ideally, a swimming pool.

Average Temperature in Las Vegas 
The hot season lasts for 3.4 months, from June 2 to September 15, with an average daily high temperature above 95°F. The hottest month of the year in Las Vegas is July, with an average high of 104°F and low of 80°F.
The cool season lasts for 3.2 months, from November 18 to February 24, with an average daily high temperature below 66°F. The coldest month of the year in Las Vegas is December, with an average low of 39°F and high of 58°F.

I'm definitely thankful for air conditioning, and anywhere with covered parking. I genuinely used to wonder how people survive here, but I only knew humid heat.

The hottest temps I have personally experienced was when I was in Bahrain for Desert Shield/Desert Storm back in '90 to '91. It got so hot during the day (118F -> 48C) that we couldn't work on the planes because the metal would burn you. The worst was at night though. Being right on the Persian Gulf the temps would drop into the 90's but the humidity would rise. I spent many nights sleeping in my own pool of sweat.