| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | -2°F | 19°F | 8°F | 4.7" |
| February | -1°F | 20°F | 9°F | 1.9" |
| March | 14°F | 34°F | 23°F | 1.6" |
| April | 29°F | 54°F | 40°F | 1.2" |
| May | 40°F | 66°F | 52°F | 3.0" |
| June | 51°F | 75°F | 62°F | 4.2" |
| July | 56°F | 81°F | 68°F | 2.5" |
| August | 52°F | 81°F | 66°F | 1.7" |
| September | 44°F | 72°F | 57°F | 1.5" |
| October | 32°F | 56°F | 42°F | 1.2" |
| November | 17°F | 37°F | 26°F | 0.8" |
| December | 1°F | 19°F | 10°F | 2.5" |
| Index | Dunseith | North Dakota | National |
| Air quality index | 36 | 35 | 42 |
| Pollution index | 408,578 | 1,038,665 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 320 |
| Days with moderate air quality | 45 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.001% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Belcourt, ND | 2,132 | 36 | 28.0% |
| East Dunseith, ND | 435 | 36 | 28.0% |
| Rolette, ND | 654 | 36 | 28.0% |
| Overly, ND | 15 | 36 | 28.0% |
| Shell Valley, ND | 1,541 | 36 | 28.0% |
| Dunseith, ND | 599 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Loleta, CA | 599 | 27 | 46.0% |
| Mount Aetna, MD | 599 | 40 | 20.0% |
| Osyka, MS | 599 | 30 | 40.0% |
| Conetoe, NC | 599 | 38 | 24.0% |
| Ashley, ND | 599 | 20 | 60.0% |
| Dunseith, ND | 599 | 36 | 28.0% |
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