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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.
Figure 8.0-6 Average monthly temperature from 1952-2007 in the AMA Planning Area. Average annual precipitation (1971-2000) ranges from 8.3 inches at Phoenix Sky Harbor Airport to 18.7 inches at Nogales and Prescott.he greatest year-to-year precipitation variations during this period occurred in the Phoenix AMA and the least variation in the Prescott AMA, with the exception of 1965 when Prescott received almost double its annual rainfall. The planning area encompasses parts of five of Arizonaâs seven climate divisions.