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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 | Wellton | Arizona | National |
| Air quality index | 45 | 57 | 42 |
| Pollution index | 2,561,410 | 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 | 0.002% |
| Benzene | 0.050% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.090% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Tacna, AZ | 580 | 45 | 10.0% |
| Wellton Hills, AZ | 397 | 45 | 10.0% |
| Fortuna Foothills, AZ | 29,297 | 45 | 10.0% |
| Wellton, AZ | 3,091 | 45 | 10.0% |
| City | Population | Air Quality Index | National Avg. |
| Shady Cove, OR | 3,090 | 36 | 28.0% |
| Corning, AR | 3,092 | 26 | 48.0% |
| Cariboo D, BC | 3,092 | n/a | |
| Biscayne Park, FL | 3,089 | 41 | 18.0% |
| East Brewton, AL | 3,093 | 41 | 18.0% |
| Wellton, AZ | 3,091 | 45 | 10.0% |
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