| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 2°F | 20°F | 10°F | 1.1" |
| February | 3°F | 22°F | 12°F | 1.5" |
| March | 18°F | 39°F | 27°F | 2.6" |
| April | 32°F | 56°F | 43°F | 5.3" |
| May | 45°F | 67°F | 54°F | 2.9" |
| June | 57°F | 77°F | 66°F | 5.2" |
| July | 60°F | 83°F | 71°F | 3.7" |
| August | 55°F | 77°F | 65°F | 6.2" |
| September | 49°F | 70°F | 58°F | 4.4" |
| October | 38°F | 56°F | 46°F | 0.5" |
| November | 24°F | 38°F | 29°F | 3.7" |
| December | 8°F | 22°F | 15°F | 1.2" |
| Index | Blackduck | Minnesota | National |
| Air quality index | 29 | 35 | 42 |
| Pollution index | 2,321,370 | 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 | 0.010% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.010% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Funkley, MN | 43 | 29 | 42.0% |
| Northome, MN | 218 | 29 | 42.0% |
| Tenstrike, MN | 190 | 29 | 42.0% |
| Turtle River, MN | 85 | 29 | 42.0% |
| Blackduck, MN | 813 | 29 | 42.0% |
| City | Population | Air Quality Index | National Avg. |
| Wilton, AL | 813 | 53 | 6.0% |
| Cottondale, FL | 813 | 35 | 30.0% |
| Tignall, GA | 813 | 44 | 12.0% |
| Colfax, IN | 813 | 42 | 16.0% |
| Castine, ME | 813 | 36 | 28.0% |
| Blackduck, MN | 813 | 29 | 42.0% |
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