Iowa has seen its coolest weather of the season to date this week with crisp over night lows in the mid 40s and even some upper 30s. These days with a cooler low temperature set for the season could be considered step downs for the year. The featured chart looks at the number of step downs each year in low temperature, the temperature at which these step downs occur and the day of the year. Yes, a lot to ingest! The middle chart nicely shows the inertia to break through the freezing level as frequencies decrease as temperatures cool to near freezing. The reason being that heat is released as water freezes, so it takes extra cooling to get further below the freezing level. The bottom chart shows that this part of September is when the cooler temperatures start to show up more commonly than in August.

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