The temperature underground at any given location is fairly steady at the average yearly temperature for that location. I don't know what it might be in a desert region, but for the northeastern US, it used to be somewhere between 50° and 55° F. That's why spring water is naturally cold. (I remember getting water straight from a spring in New Hampshire, fifty years ago, on a hot summer day - I poured a dipperful of it right over my head, which made my father laugh, and then drank another dipperful.) This is also part of why earth-berm houses are so efficient to heat and cool. When it's too hot outside, you've still got the cool ground around you; when it's too cold out, it's easy enough to use a heat pump to take warmth from that 55° source.
EDIT: LJ seems to be screwing up userpics again - it was supposed to be a photo of Earth from Space, but it became an animation of a robot smoking a cigar.
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EDIT: LJ seems to be screwing up userpics again - it was supposed to be a photo of Earth from Space, but it became an animation of a robot smoking a cigar.
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