| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 1°F | 22°F | 11°F | 0.9" |
| February | 3°F | 24°F | 13°F | 0.6" |
| March | 18°F | 40°F | 29°F | 1.0" |
| April | 32°F | 58°F | 45°F | 1.7" |
| May | 44°F | 72°F | 57°F | 3.3" |
| June | 55°F | 81°F | 68°F | 4.6" |
| July | 59°F | 86°F | 73°F | 2.6" |
| August | 56°F | 83°F | 69°F | 3.0" |
| September | 48°F | 76°F | 61°F | 3.1" |
| October | 37°F | 61°F | 47°F | 2.4" |
| November | 22°F | 44°F | 32°F | 0.7" |
| December | 6°F | 26°F | 16°F | 1.1" |
| Index | Mahnomen | Minnesota | National |
| Air quality index | 33 | 35 | 42 |
| Pollution index | 345,337 | 1,854,519 | 2,726,193 |
| Measurement | Total |
| Days measured | 363 |
| Days with good air quality | 327 |
| Days with moderate air quality | 34 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 1 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.001% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| White Earth, MN | 478 | 33 | 34.0% |
| Gary, MN | 297 | 33 | 34.0% |
| Twin Lakes city, MN | 168 | 33 | 34.0% |
| Beaulieu, MN | 62 | 33 | 34.0% |
| Mahnomen CDP, MN | 268 | 33 | 34.0% |
| Mahnomen, MN | 1,160 | 33 | 34.0% |
| City | Population | Air Quality Index | National Avg. |
| Mount Ida, AR | 1,160 | 38 | 24.0% |
| Third Lake, IL | 1,160 | 39 | 22.0% |
| Atglen, PA | 1,160 | 45 | 10.0% |
| Avonmore, PA | 1,160 | 38 | 24.0% |
| Fairhope, PA | 1,160 | 36 | 28.0% |
| Mahnomen, MN | 1,160 | 33 | 34.0% |
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