| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 3°F | 22°F | 13°F | 0.3" |
| February | 5°F | 26°F | 15°F | 0.3" |
| March | 20°F | 41°F | 30°F | 1.0" |
| April | 33°F | 56°F | 44°F | 1.8" |
| May | 45°F | 69°F | 56°F | 3.9" |
| June | 55°F | 78°F | 66°F | 4.2" |
| July | 60°F | 83°F | 71°F | 5.1" |
| August | 57°F | 80°F | 68°F | 3.5" |
| September | 50°F | 71°F | 60°F | 2.8" |
| October | 38°F | 57°F | 46°F | 2.9" |
| November | 25°F | 42°F | 33°F | 0.9" |
| December | 9°F | 25°F | 17°F | 0.6" |
| Index | Aitkin | Minnesota | National |
| Air quality index | 29 | 35 | 42 |
| Pollution index | 1,078,800 | 1,854,519 | 2,726,193 |
| Measurement | Total |
| Days measured | 359 |
| Days with good air quality | 328 |
| Days with moderate air quality | 29 |
| Days w/ poor A.Q. for sensitive groups | 2 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.010% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Crosby, MN | 2,780 | 29 | 42.0% |
| Ironton, MN | 505 | 29 | 42.0% |
| Cuyuna, MN | 291 | 29 | 42.0% |
| Trommald, MN | 94 | 29 | 42.0% |
| Deerwood, MN | 728 | 29 | 42.0% |
| Aitkin, MN | 2,253 | 29 | 42.0% |
| City | Population | Air Quality Index | National Avg. |
| Pymatuning Central, PA | 2,253 | 34 | 32.0% |
| Swepsonville, NC | 2,254 | 31 | 38.0% |
| Brewster, OH | 2,254 | 46 | 8.0% |
| Terrace Park, OH | 2,254 | 54 | 8.0% |
| Stephens City, VA | 2,254 | 38 | 24.0% |
| Aitkin, MN | 2,253 | 29 | 42.0% |
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