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Wow that last graphic is really cool.  So I've read enough of your blogs to make the educated guess of water vapor/clouds tending to congregate in different areas of the continent to explain the temperature variabilities.  The clouds trapping some warmth at night and lack of them allowing for more heat loss.  Just like when your graphics show the clouds changing locations in with the Walker Circulation changes.  I guess that could be confirmed or ruled out with satellite imagery or something like it?