For the same reason mountains have snow on them all year round.
The higher you go the colder it gets, the lower you go the hotter it gets, and Death Valley is one of the lowest points in the world. A bit less than 300 feet below sea level.
And the reason the temperature changes is just because the air is more dense at lower altitudes.
And a side note for some of the other commentators: water vapor is the most effective greenhouse gas in our atmosphere. Clouds would make it even *hotter.*
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