The featured graph is a time series of temperature and dew point from Des Moines for the month of June. June started off on the cool side thanks in part to a dry northerly wind that kept dew points mostly in the 50s. Around the 17th of June, the rich moisture returned and so has the warmer weather. Higher dew points act to put a floor in on how low temperatures can get during the night and as dew points have increased, so has the temperatures.

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Tags:   jun09