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June Heat Index in Maricopa County

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Visualization Notes:

An increase in the heat index is especially notable during the nighttime hours.  Elevated nighttime temperatures, an effect of the urban heat island, along with humidity which tends to be highest during predawn hours, result in a high heat index during the 9 pm to 4 am time period.

The heat index is important because, when heat and humidity combine to reduce the amount of evaporation of sweat from the body, outdoor exercise becomes dangerous even for those in good shape.