Ha! ya, first time I realized this I was like 14 and we went to the Midwest during the summer and there was a big storm. Before that, I always thought summer = dry and hot everywhere.
It's funny you mention this, I'm 37 and just visited Las Vegas for the first time recently ... as a Floridian, I never fathomed that air could be _that dry_.
I suspect everyone thinks that. It's all those people from other parts of the world/country that have accents. :)