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The highest monthly average temperature in Gilbert for July is 96 degrees. The lowest monthly average temperature in Gilbert for December is 53 degrees. The most monthly precipitation in Gilbert occurs in January with 0 inches. The air quality index in Gilbert is 49% worse than the national average. The pollution index in Gilbert is 20% better than the national average.
Average annual temperatures range from 72.9Â°F in the Phoenix AMA to 53.3Â°F in the Prescott AMA compared to the statewide average of 59.5Â°F. Phoenix and Tucson climate stations report the warmest temperatures with the exception of the summer monsoon season when Tucson receives a significant amount of its annual rainfall and associated cooler ...