Yesterday's feature presented the largest temperature drop over 24 hours for the most recent cold front passage. Today's featured chart presents a histogram of these changes for Des Moines over its period of record by week of the year. The area of peak frequencies is interesting in this plot. It exists for slightly negative numbers between June and October. This area represents slight day to day cooling with temperatures being the most common regime. Without solar input, our temperatures would cool each day, that is our baseline regime. Warm air masses and the sun fight this cooling each day, attempting to warm us up.

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Tags:   temperatures