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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 8°F | 25°F | 16°F | 0.4" |
| February | 7°F | 27°F | 17°F | 0.2" |
| March | 19°F | 41°F | 29°F | 0.6" |
| April | 29°F | 54°F | 41°F | 1.7" |
| May | 41°F | 69°F | 54°F | 2.4" |
| June | 51°F | 77°F | 63°F | 2.8" |
| July | 56°F | 82°F | 69°F | 2.2" |
| August | 54°F | 79°F | 66°F | 2.2" |
| September | 47°F | 71°F | 58°F | 2.8" |
| October | 36°F | 56°F | 46°F | 2.0" |
| November | 26°F | 43°F | 34°F | 0.8" |
| December | 13°F | 28°F | 21°F | 0.7" |
| Index | Iron Mountain | Michigan | National |
| Air quality index | 36 | 69 | 42 |
| Pollution index | 1,372,730 | 4,161,606 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 311 |
| Days with moderate air quality | 54 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.010% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Florence, WI | 428 | 8 | 84.0% |
| Goodman, WI | 276 | 34 | 32.0% |
| Dunbar, WI | 56 | 36 | 28.0% |
| Norway, MI | 2,744 | 36 | 28.0% |
| Quinnesec, MI | 1,203 | 36 | 28.0% |
| Iron Mountain, MI | 7,352 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Globe, AZ | 7,351 | 60 | 20.0% |
| Charles City, IA | 7,351 | 15 | 70.0% |
| Sandwich, IL | 7,351 | 0 | 100.0% |
| Hudsonville, MI | 7,353 | 38 | 24.0% |
| Tuttle, OK | 7,348 | 48 | 4.0% |
| Iron Mountain, MI | 7,352 | 36 | 28.0% |
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