A cold front swept the state clean of some muggy air on Monday and the next few days look like a delicious taste of fall weather with some very chilly overnight lows expected. The featured chart presents a look at season to date accumulated coldest low temperature for Ames since 1 July. The chart presents the climatology along with the actual observed 2021 value. This year has remained on the warm side of average, but with forecast lows near 40 degrees, we will quickly catch up to average for this time of year. This is also the time of year when we starting thinking about the first freeze as shown by the plotted range of values reaching 32 degrees around the middle of September. The agricultural crops planted on a reasonable date this spring should be in great maturity shape, so an early frost is not as big of a concern this year.

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