The featured chart displays the daily high temperature standard deviation for Des Moines for two variables. The first being the spread of highs for a given day and the second being the spread of day to day changes in high temperature. The lower chart presents the ratio between these two values. July shows the least variability for both parameters as warm soils and elevated humidities help to regulate temperatures. The chart shows that the day to day variability is lower than the long term variability for that day. This makes sense as the long term distribution of temps creates a bounds for the day to day variability and also there is a bit of memory in the day to day temperatures, so the daily high temperature yesterday has a higher influence than the high temperature for the previous year for that date.

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Tags:   highs