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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 Temperatures in Phoenix, Arizona, Usa. 1  The annual average temperature in Phoenix, Arizona, Usa is really warm at 22.6 degrees Celsius (72.7 degrees Fahrenheit). 2  There is a variation of mean monthly temperatures of 22.2 C (40 F) which is a below moderate range.