In the summer, with uncovered parking, it's easily 150+ in a car that's been sitting out.
You know, depending on the meat and your working hours, you quite literally could leave a cut of meat in the front seat and have it be nice and tender by the time you drive home. I mean, (say) 175 for 10 hours? That would slow roast most cuts of pork. I'm a bit disappointed I never tried it. (I did try to fry an egg on the hood of a car one time. I got a white film on the bottom, but it didn't come close to cooking the yolk.)
I think most Texans (and I still consider myself one, even despite the fact that I got the hell out of there at 22 and go back maybe every 2-3 years, even though all of my family is in Dallas) have "crazy sh!t that melted in my car" stories. A college girlfriend bought a Beatles box set in Dallas in the summer, drove to her apartment in San Antonio, left the CDs in her trunk overnight, and by the time she pulled them out the next morning, them were all warped and unplayable.
Guys, I'm not joking. There are many reasons why Texas isn't so fun (rednecks, cultural wasteland, etc.). There are work-arounds to most of them. And the dirty little secret is that there are some really fun parts of Dallas and San Antonio and Houston and (of course) Austin. And it's all cheap! But the weather is really as bad as advertised. Honestly, if given the choice between Nome, Alaska and Texas, my first question would be whether the winter coats count as a tax deductible business expense. Because there ain't no way I'm going through another Texas summer.