| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 33°F | 62°F | 46°F | 0.7" |
| February | 36°F | 69°F | 52°F | 0.3" |
| March | 42°F | 77°F | 59°F | 0.2" |
| April | 48°F | 84°F | 67°F | 0.1" |
| May | 56°F | 92°F | 75°F | 0.1" |
| June | 67°F | 103°F | 86°F | 0.3" |
| July | 73°F | 100°F | 86°F | 2.1" |
| August | 71°F | 98°F | 84°F | 1.3" |
| September | 64°F | 93°F | 78°F | 1.3" |
| October | 52°F | 85°F | 68°F | 0.7" |
| November | 42°F | 73°F | 57°F | 0.3" |
| December | 33°F | 61°F | 46°F | 0.6" |
| Index | Morenci | Arizona | National |
| Air quality index | 37 | 57 | 42 |
| Pollution index | 841,255 | 9,766,019 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 362 |
| Days with moderate air quality | 3 |
| Days w/ poor A.Q. for sensitive groups | |
| Days with unhealthy air quality |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Clifton, AZ | 3,689 | 37 | 26.0% |
| York, AZ | 630 | 37 | 26.0% |
| Morenci, AZ | 1,494 | 37 | 26.0% |
| City | Population | Air Quality Index | National Avg. |
| Pinconning, MI | 1,494 | 26 | 48.0% |
| Pemberton, NJ | 1,494 | 41 | 18.0% |
| Wilson, OK | 1,494 | 43 | 14.0% |
| Montgomery, PA | 1,494 | 35 | 30.0% |
| Rosser, MB | 1,494 | n/a | |
| Morenci, AZ | 1,494 | 37 | 26.0% |
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