The featured chart presents monthly precipitation departures for Ames along with El Nino 3.4 monthly index values. It is interesting to see all of the negative precipitation departures since the start of 2020 coinciding with the neutral to weak La Nina state. Substantial positive departures have not happened since the El Nino index was in positive territory. While El Nino / La Nina does help explain some of our weather over long periods of time, it is not the a direct relationship and often complicated by other larger scale oscillations in the global flow of heat and moisture. September has started off very dry as well, so the recent trend looks to continue.

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