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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.
July is the hottest month in Phoenix with an average temperature of 33Â°C (91Â°F) and the coldest is January at 12Â°C (54Â°F) with the most daily sunshine hours at 14 in June. The wettest month is August with an average of 32mm of rain.