One of the aspects that makes this time of year nice in Iowa is the general lack of significant humidity. This lack of humidity is helped by having a landscape around us that is generally void of transpiring crops this time of year. The featured chart illustrates this by comparing the daily specific humidity change between 6 AM to 6 PM for Ames. Transpiring crops and other vegetation add moisture to the air during the daytime and thus increasing the humidity. The featured chart nicely shows the primary season for this addition of water to the atmosphere between early June and rapidly dropping off during September.

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