| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 20°F | 34°F | 26°F | 4.1" |
| February | 15°F | 30°F | 23°F | 2.1" |
| March | 28°F | 46°F | 36°F | 2.2" |
| April | 38°F | 63°F | 50°F | 4.6" |
| May | 47°F | 73°F | 59°F | 2.8" |
| June | 60°F | 85°F | 72°F | 6.3" |
| July | 60°F | 84°F | 72°F | 6.2" |
| August | 63°F | 83°F | 72°F | 10.5" |
| September | 53°F | 80°F | 66°F | 2.8" |
| October | 46°F | 67°F | 55°F | 2.7" |
| November | 32°F | 49°F | 40°F | 2.8" |
| December | 21°F | 32°F | 27°F | 3.5" |
| Index | Morenci | Michigan | National |
| Air quality index | 39 | 69 | 42 |
| Pollution index | 2,138,860 | 4,161,606 | 2,726,193 |
| Measurement | Total |
| Days measured | 358 |
| Days with good air quality | 286 |
| Days with moderate air quality | 72 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.040% |
| Mercury | 0.260% |
| City | Population | Air Quality Index | National Avg. |
| Adrian, MI | 20,550 | 39 | 22.0% |
| Waldron, MI | 544 | 39 | 22.0% |
| Archbold, OH | 4,379 | 39 | 22.0% |
| Delta, OH | 2,838 | 39 | 22.0% |
| Clayton, MI | 267 | 39 | 22.0% |
| Morenci, MI | 1,932 | 39 | 22.0% |
| City | Population | Air Quality Index | National Avg. |
| Milo, ME | 1,932 | 31 | 38.0% |
| Clayton, NY | 1,932 | 35 | 30.0% |
| Peach Lake, NY | 1,932 | 43 | 14.0% |
| Jonestown, PA | 1,932 | 42 | 16.0% |
| Lykens, PA | 1,932 | 42 | 16.0% |
| Morenci, MI | 1,932 | 39 | 22.0% |
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