| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 4°F | 24°F | 14°F | 1.0" |
| February | 5°F | 25°F | 14°F | 0.6" |
| March | 18°F | 40°F | 28°F | 1.2" |
| April | 30°F | 55°F | 41°F | 1.6" |
| May | 41°F | 68°F | 54°F | 3.4" |
| June | 52°F | 76°F | 63°F | 3.5" |
| July | 57°F | 83°F | 70°F | 2.8" |
| August | 55°F | 82°F | 67°F | 2.3" |
| September | 47°F | 74°F | 59°F | 1.9" |
| October | 34°F | 56°F | 44°F | 1.1" |
| November | 20°F | 41°F | 30°F | 0.5" |
| December | 6°F | 24°F | 15°F | 1.1" |
| Index | Coleharbor | North Dakota | National |
| Air quality index | 36 | 35 | 42 |
| Pollution index | 10,956,300 | 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 | 0.390% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.100% |
| Mercury | 0.250% |
| City | Population | Air Quality Index | National Avg. |
| Riverdale, ND | 192 | 36 | 28.0% |
| Underwood, ND | 768 | 36 | 28.0% |
| Garrison, ND | 1,708 | 36 | 28.0% |
| Pick City, ND | 120 | 36 | 28.0% |
| Coleharbor, ND | 91 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Lowell Point, AK | 91 | 31 | 38.0% |
| Guion, AR | 91 | 36 | 28.0% |
| Hat Creek, CA | 91 | 42 | 16.0% |
| Lake Davis, CA | 91 | 44 | 12.0% |
| Peoria, CO | 91 | 58 | 16.0% |
| Coleharbor, ND | 91 | 36 | 28.0% |
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