IEM Daily Feature
Tuesday, 22 September 2015

September Dew Points

Posted: 22 Sep 2015 05:41 AM

The featured chart displays the average dew point at a given temperature in September for Des Moines. With that dew point, the relative humidity is plotted as well. In general, air temperatures warm faster than humidity levels are able to increase due to evapotranspiration. The net effect is for relative humidity to decrease during the daytime hours. The more arid the climate, the steeper this line will be and you can check that out for yourself by generating this chart for locations out in Arizona, for example.

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Tags:   rh