Tuesday was a spectacular day in Iowa with warm temps and comfortable humidity levels. The featured chart presents the average dew point at a given observed air temperature for June. That average value is then used to compute the relative humidity at that temperature. Please note that the average dew point is computed by averaging the observed mixing ratios rather than a simple average of the observed dew points. In general, the relative humidity falls as the temperature warms, which makes sense as the heating of the air during the day time happens faster than water can be evaporated into it. You can generate this chart on the website for other reporting locations and other months / seasons of your choice.

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