Some of the coolest temperatures of the second half of the calendar year are present over Iowa this morning. The coolest low temperature for Ames has yet to breach 50 degrees. The featured chart displays the combination of the date of the first fall season sub-50 degree low temperature and the subsequent number of days until the first sub-40 degree temperature happened. That outlier blip shown near July 8 happened back in 1895. The dashed lines on the chart allow the forward translation of the dots to an actual date. So having the first sub-50 is not uncommon for any time during the late summer season. It certainly takes longer until the first sub-40 is common for Ames.

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