The primary purpose of an airport weather station is support aviation needs for planes to take off and land. The combination of horizontal visibility and height to cloud ceiling establishes a flight rule category, which may limit the types of aircraft and pilots that can fly during that time. The featured chart presents the hourly flight rule category for Des Moines for the month of June. Visual Flight Rules (VFR) dominated for the month, which is typical as cloud decks are typically quite high and fog conditions are limited. This type of chart nicely summarizes when the worst of the month's conditions occurred, which was clearly on the 19th and 20th of the month.

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