If the temperatures aren't enough to convince you that it's hellishly hot, perhaps the sudden appearance of zubats over the dashboard might change your mind.
"We were somewhere around Barstow on the edge of the desert when the drugs began to take hold. I remember saying something like `I feel a bit lightheaded; maybe you should drive. . . .' And suddenly there was a terrible roar all around us and the sky was full of what looked like huge bats, all swooping and screeching and diving around the car, which was going about a hundred miles an hour with the top down to Las Vegas." - Hunter S. Thompson, Fear and Loathing in Las Vegas