While some isolated locations in northwestern Iowa have dipped into the 30s, there has yet to be any sub 32 degree temperatures in the state so far. Having said that, we are now at the time of the year that such values are possible based on climatology. The featured chart presents the accumulated frequency and percentile dates of having the first fall low temperature at or below the given threshold by the given date of the year for Ames. The table lists the percentiles along with the earliest and latest calendar dates at the given threshold. For Ames, you can see the first 32 happened on 13 September 1902, which was yesterday for a calendar date! You can see that the frequencies rapidly increase by the day. Values well below 32 though don't start rapidly increasing until October. You can generate this chart for other locations and thresholds of your choice by following the "Generate this chart" button.

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Tags:   fall