The featured chart displays the accumulated number of hours where the heat index was above a given value. This only includes hourly reports whereby the heat index was warmer than the temperature. For Des Moines, this chart tells an interesting story when compared with simple year to date averages since 1973. For heat index values between 90 and 100, we are above average, but below average for warmer values over 100 degrees.

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Tags:   heatindex