After a mild start on Wednesday morning, an arctic front swept the state and ushered in much colder temperatures and the coldest air of the season to date. Low temperatures this Thursday morning are well below zero and likely record lows for today for many sites in the state. The featured chart looks into the accumulated frequency of having the season's first low temperature of the given threshold by the given date of the season for Ames. The chart plots as a percentile over all years, so there are some years that failed to reach the given threshold and that is why the accumulated value does not reach 100 in all cases. The side table shows the percentile dates for each threshold. Having such cold weather by 4 December comes in around the 10-25th percentile of so, so about once or twice per decade to experience such cold temperatures this early for the given thresholds plotted.

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