After a number of days this September with not much wind, the increase in wind with the passage of a dry front on Monday was noticeable. The featured chart illustrates how calm this September has been by showing average wind speeds each September for Des Moines. The 2024 value is one of the slowest on record for the site. The lack of passing storm systems certainly contributed to the lack wind for the month. The black line on the upper chart represents a trailing 30 year average and the recent trend certainly seems to be downward. The caveat is that long term wind trend assessment is fraught with peril as observation techniques and instrumentation has changed over the years.

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