The first day of 2026 started off a bit chilly with afternoon temperatures below freezing for nearly the entire state. Both Burlington (SE Iowa) and Sioux City (NW Iowa) had afternoon high temperatures of 28°F and that is the subject of today's feature chart. The top panel presents the difference in afternoon high temperature between the two sites by week of the year. The darker green colors indicate higher frequency and a simple weekly average is fit to the data with the plotted line. The bottom panel partitions the temperature difference by Sioux City average wind speed over the afternoon period. The top panel shows the difference between the two sites is the strongest during the cold half of the year, but the magnitude is only a few degrees.

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