The last day of May is at hand and while more rain is failing today, the current difference between May rainfall totals for a location in far NW Iowa is compared against far SE Iowa in today's featured chart. Based on preliminary data, Rock Rapids has seen just over four inches more precipitation than Keokuk so far this May. This would be the largest difference since the early 1970s. Typically, the largest rainfall totals are over SE Iowa in May with the smallest over NW Iowa. So this May has seen a reversal of that, but it is not uncommon.

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