Phoenix, Arizona has had 25 consecutive days of 110-degree days, a record heat streak. The Urban Heat Island Effect and a delayed start to the Southwestern monsoon season are each partially responsible for the unrelenting heat of the desert climate.

Potential Useful Information:
Arizona's Monsoon Season (National Weather Service)
More Southwestern United States Monsoon info (National Weather Service)
Looped Radar depicting Southwestern U.S. Monsoon, Rotation about High Pressure
Urban Heat Island information (Environmental Protection Agency)
Phoenix 2020 Urban Heat Island Figures (Arizona State University)

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Enjoy your week, and keep your eyes on the skies!