| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 41°F | 64°F | 50°F | 4.8" |
| February | 45°F | 68°F | 55°F | 1.1" |
| March | 47°F | 75°F | 60°F | 2.2" |
| April | 53°F | 83°F | 68°F | 2.8" |
| May | 63°F | 93°F | 78°F | 1.1" |
| June | 71°F | 100°F | 87°F | 0.0" |
| July | 77°F | 101°F | 88°F | 8.8" |
| August | 74°F | 96°F | 84°F | 8.1" |
| September | 71°F | 96°F | 82°F | 4.1" |
| October | 59°F | 87°F | 72°F | 1.8" |
| November | 51°F | 78°F | 64°F | 0.0" |
| December | 40°F | 66°F | 51°F | 1.5" |
| Index | Sewell | Tucson | Arizona |
| Air quality index | 47 | 47 | 57 |
| Pollution index | 4,063,380 | 4,063,380 | 9,766,019 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 225 |
| Days with moderate air quality | 138 |
| Days w/ poor A.Q. for sensitive groups | 2 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.004% |
| Benzene | 0.060% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.040% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Catalina Foothills, AZ | 50,631 | 47 | 6.0% |
| Littletown, AZ | 645 | 47 | 6.0% |
| Summit, AZ | 5,066 | 47 | 6.0% |
| Valencia West, AZ | 12,201 | 47 | 6.0% |
| Summerhaven, AZ | 35 | 47 | 6.0% |
| Tucson, AZ | 545,340 | 47 | 6.0% |
| City | Population | Air Quality Index | National Avg. |
| Québec, QC | 548,244 | n/a | |
| Surrey, BC | 560,150 | n/a | |
| Albuquerque, NM | 560,447 | 53 | 6.0% |
| Fresno, CA | 526,147 | 60 | 20.0% |
| Mesa, AZ | 508,918 | 74 | 48.0% |
| Tucson, AZ | 545,340 | 47 | 6.0% |
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