The hottest day of the year waited all summer until the start of school to occur. The entire state was covered by an Excessive Heat Warning due to heat index values pushing 110°F and higher. Dew point readings were ugly with values in the upper 70s and lower 80s. The featured chart presents the maximum reported dew point temperature on Monday from the airport weather stations. A 90°F value is shown in southeastern Iowa and is certainly an invalid observation. 80°F dew points happen a couple of times per year, but this event was combined with air temperatures in the upper 90s, which made for very dangerous conditions.

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