It's cliche, but it's a dry heat. It's like walking into an oven -- it's hot, but you're not dripping with sweat.
It's true at Vegas temperatures of 105-115°F, but the cliche doesn't really work in Laughlin/Bullhead City, where they grossly under-report the temperatures during the summer. Joey at NLG thinks they're trying not to scare away the tourists.
For example: They reported the high in Bullhead as 114°F today and listed a temperature of 108°F at noon. So what's wrong with this picture? Well, Joey posted a picture today on Fakebook of his outdoor thermometer taken at 8:30 this morning and it read a blistering
121°F. At EIGHT THIRTY in the MORNING! That's just too damned hot for human beings, dry or not.
One can't even argue that the placement of his thermometer gave a falsely high reading due to being in direct sunlight. Not at 8:30am.