May Day felt more like Mother Nature yelling "mayday" as very cold air along with snow entered the state. The cold front still bisected the state by mid afternoon on Wednesday leaving the far eastern portions in the warm air. Temperatures soared well into the 80s while northwest Iowa was near freezing. The featured top chart displays the hourly temperature difference between Burlington and Sioux City since 1 March. The largest difference was 48 degrees with Burlington reporting 82 degrees while Sioux City was at 34. Based on IEM archives, this was the largest temperature difference between the sites on record for May. The largest difference for any month is 61 degrees on 14 Dec 2008.

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