| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | -1°F | 20°F | 9°F | 0.4" |
| February | 0°F | 24°F | 12°F | 0.4" |
| March | 15°F | 39°F | 27°F | 1.0" |
| April | 28°F | 53°F | 40°F | 1.8" |
| May | 38°F | 66°F | 51°F | 3.0" |
| June | 47°F | 74°F | 61°F | 4.8" |
| July | 52°F | 80°F | 66°F | 2.9" |
| August | 50°F | 77°F | 63°F | 3.3" |
| September | 43°F | 69°F | 55°F | 3.1" |
| October | 33°F | 54°F | 43°F | 2.4" |
| November | 20°F | 38°F | 29°F | 1.0" |
| December | 5°F | 22°F | 14°F | 0.5" |
| Index | Chisholm | Minnesota | National |
| Air quality index | 35 | 35 | 42 |
| Pollution index | 1,096,210 | 1,854,519 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 326 |
| Days with moderate air quality | 38 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.020% |
| Lead | 0.030% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Hibbing, MN | 15,923 | 35 | 30.0% |
| Leonidas, MN | 37 | 35 | 30.0% |
| Iron Junction, MN | 93 | 35 | 30.0% |
| Mountain Iron, MN | 2,854 | 35 | 30.0% |
| Keewatin, MN | 1,255 | 35 | 30.0% |
| Chisholm, MN | 4,879 | 35 | 30.0% |
| City | Population | Air Quality Index | National Avg. |
| Michigan Center, MI | 4,879 | 39 | 22.0% |
| Mayfair, CA | 4,878 | 60 | 20.0% |
| Mendham, NJ | 4,880 | 34 | 32.0% |
| New Castle, CO | 4,877 | 44 | 12.0% |
| Brookridge, FL | 4,881 | 30 | 40.0% |
| Chisholm, MN | 4,879 | 35 | 30.0% |
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