Air temperatures on Tuesday were remarkably different than on Monday with values 20 some degrees Fahrenheit cooler. The featured chart presents a histogram of 24 hour air temperature changes for Des Moines. Values are partitioned by week of the year and over one degree interval changes. The largest frequencies are found close to zero during the heart of the summer season. This is due to the elevated humidity levels and warm soil temperatures acting to buffer any abrupt changes. Values of -20 or more are very limited during the months of July and August, so our change from Monday to Tuesday is a bit rare. This chart also nicely illustrates that persistence is typically a good forecast during the summer months as day to day changes are the smallest.

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