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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.
Annual mean temperatures for most major US cities average between 50 and 70 degrees Fahrenheit (10 to 21 degrees Celsius). For all cities, average low temperatures over the year are well above freezing. Most large cities have average annual high temperatures between 60 and 70 degrees F (16 to 21 Â°C). Scorching hot summers in Phoenix, Arizona, pushes the average high temperature to 87 Â°F (31 Â°C). Miami and Orlando's average highs, though also in the 80s, come from consistently warm weather year round.