Death Valley National Park was an impromptu visit that we made last year on our way to California. We visited in October and it was SO hot. I think the temperatures in my car got up to over 100 degrees and there were even road signs that advised drivers to limit their air-conditioning (so their car would not overheat). We also drove through several sandstorms, which is scary/exhilarating/crazy! I couldn't imagine hiking through the sand dunes (some people were doing) and also can never imagine visiting this park in the summer! I'm sure it could be pretty enjoyable in January and the camping spots looked amazing, but it was so hot and windy that there was no way we could envision ourselves camping there in October. It's a great park to drive-through with a dependable car (and lots of gas)!