Based on preliminary data, the August precipitation total for Ionia (north of Waterloo) stands at 20.88 inches. Having a 20+ inch precipitation month is a rather rare feat in Iowa. The featured table presents a listing of the four other currently known 20+ inch monthly events. Please note that this list has been hand quality controlled as there are a couple of additional events found in the IEM / ACIS databases that look very suspect. The table also lists the largest single day (24 hour) precipitation total for that site and month. Getting one big daily rain certainly helps get that total to 20, but the Clio July 1993 maximum value of just 3.38 inches makes for a remarkable feat to reach 20 inches for the month.

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Tags:   aug21