Sioux City set a record low Sunday morning of 36°F, breaking the previous record of 38°F set in 1986. This was also the earliest date for such a cool temperature for the site on record with archives going back to 1889! The featured chart presents the yearly period between the last spring season and first fall season date with a low temperature below 37°F. The yearly time series of dates is fit with a trend line, simple average, and trailing 30 year average. The recent trend and fit lines don't indicate much change for this metric over the period of record.

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