Very cold air arrived last week and has mostly stuck around through the weekend. The featured chart highlights the accumulated min low temperature for Primghar (far northwestern Iowa) since 1 July. After having very little cold weather up through most of September, the low temperature reached just four degrees this past weekend. The chart shows the long term average, selected percentiles and range over the period of record. Hitting four degrees this early in November is a bit out of the ordinary for the location, but temperatures has certainly been much colder by now over year's past.

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