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Want some proof? How about this?
On June 27, 2011, Las Vegas, Nevada, recorded its driest day ever when the city's relative humidty fell to just 3/5 of one percent, yielding a dewpoint of -22 degrees. The air temperature was 107.
http://www.wunderground.com/blog/JeffMasters/comment.html?entrynum=1833
I can only assume this isn’t all you have. What else?