The featured map presents the difference in precipitation total per year between the most recent 30 year periods during the summer (June, July, August) season. For example, a plotted two inch value would imply that on-average two more inches per year fell during the summer season during the 1991-2020 period vs 1961-1990. On a small spatial and even temporal scale, these type of plots tend to be noisy as individual wet years like 1993 can skew the results somewhat. It is still interesting to see the general increases and the most consistent increases over northeastern Iowa. For a state dominated by seasonal rain-fed agricultural, having more rainfall during the summer season is likely a net positive.

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