The Iowa State Fair concluded on Sunday with quite steamy conditions with heat index values above 100°F. Using the Des Moines Airport hourly weather reports as a close proxy to the fair conditions, the featured chart presents an IEM accounting of the number of hours each year during the days of the fair with a heat index of at least 86°F. While data does exist prior to 1973, this chart starts off during that year due to observation changes and a troublesome period prior to 1973 with only three-hourly reports. The 2025 total is the highest since 2010 and well within the top 10 for this plotted period. The steamy weather will stick around for a few more days this week before much more pleasant conditions arrive and last into the weekend.

Voting:
Good = 10
Bad = 0

Tags:   statefair