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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 48°F | 71°F | 59°F | 4.4" |
| February | 49°F | 74°F | 60°F | 2.7" |
| March | 53°F | 81°F | 66°F | 4.0" |
| April | 59°F | 88°F | 72°F | 1.4" |
| May | 66°F | 96°F | 81°F | 0.2" |
| June | 74°F | 105°F | 89°F | 3.3" |
| July | 83°F | 108°F | 95°F | 3.7" |
| August | 84°F | 109°F | 95°F | 0.8" |
| September | 77°F | 103°F | 89°F | 4.0" |
| October | 66°F | 92°F | 78°F | 0.4" |
| November | 54°F | 80°F | 66°F | 1.2" |
| December | 46°F | 70°F | 57°F | 2.8" |
| Index | San Luis | Arizona | National |
| Air quality index | 45 | 57 | 42 |
| Pollution index | 6,200,930 | 9,766,019 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 265 |
| Days with moderate air quality | 97 |
| Days w/ poor A.Q. for sensitive groups | 3 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.200% |
| Benzene | 0.130% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.090% |
| Mercury | 0.070% |
| City | Population | Air Quality Index | National Avg. |
| Drysdale, AZ | 389 | 45 | 10.0% |
| Rancho Mesa Verde, AZ | 861 | 45 | 10.0% |
| Gadsden, AZ | 873 | 45 | 10.0% |
| Somerton, AZ | 16,301 | 45 | 10.0% |
| Orange Grove Mobile Manor, AZ | 387 | 45 | 10.0% |
| San Luis, AZ | 33,875 | 45 | 10.0% |
| City | Population | Air Quality Index | National Avg. |
| Cottonwood Heights, UT | 33,865 | 51 | 2.0% |
| Glendale Heights, IL | 33,863 | 55 | 10.0% |
| Chester, PA | 33,855 | 51 | 2.0% |
| Golden Glades, FL | 33,843 | 41 | 18.0% |
| LaSalle, ON | 33,838 | n/a | |
| San Luis, AZ | 33,875 | 45 | 10.0% |
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