Following up on my original post, today the stats were:
Death Valley: 126 F (52 C)
Truckee: 30 F (-1 C)
A spread of 96 F (51 C) in roughly the same geographic area on the same day. A couple of additional thoughts. The 96 F spread today was obviously pretty unusual, not only for anywhere in the world, but ever for this area of California. But, one of the points of my original thread was that this a very common thing. Virtually every day of the summer, there is a spread of 80+ F in this region of eastern California. It's not that a crazy heat wave hits, or there is some nutty cold front sweeping in. And, another point is, these are two inhabited places. I'm sure if we went to tops of the Sierras, at 14,000 ft, the spread would be bigger.