While not overly strong, the persistent La Nina state of the Pacific Ocean has spelled trouble for drought over much of the country. The featured chart presents the combination of monthly El Nino 3.4 index and monthly statewide Iowa precipitation departures. The mostly dry months and negative El Nino (which means La Nina) index values since early 2020 are noticeable. The relationship between Iowa's weather and this index is complex, modified by other large scale earth air circulations, and has seasonal dependencies. So while the index value does not directly predict our weather, it certainly biases what we can expect to the dry side of average.

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