Climate
When does the monsoon start in arizona?
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According to the Arizona Department of Transportation, Arizona's monsoon season starts in June and goes through September.
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The North American Monsoon (NAM) occurs from late June or early July into September, originating over Mexico and spreading into the southwest United States by mid-July. This allows the wet season to start in the Southwest during the summer rather than early fall as seen across the remainder of West.
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