| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 3°F | 21°F | 12°F | 2.0" |
| February | 5°F | 25°F | 14°F | 0.7" |
| March | 16°F | 38°F | 26°F | 1.2" |
| April | 27°F | 52°F | 38°F | 2.9" |
| May | 43°F | 68°F | 55°F | 4.1" |
| June | 51°F | 76°F | 63°F | 4.2" |
| July | 55°F | 81°F | 67°F | 5.7" |
| August | 53°F | 80°F | 66°F | 3.6" |
| September | 47°F | 72°F | 58°F | 3.8" |
| October | 34°F | 56°F | 43°F | 2.6" |
| November | 18°F | 39°F | 28°F | 0.7" |
| December | 5°F | 23°F | 14°F | 0.8" |
| Index | Douglas | North Dakota | National |
| Air quality index | 36 | 35 | 42 |
| Pollution index | 4,994,790 | 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 | 0.020% |
| Benzene | 0.070% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.040% |
| Mercury | 0.020% |
| City | Population | Air Quality Index | National Avg. |
| Makoti, ND | 133 | 34 | 32.0% |
| Ryder, ND | 109 | 36 | 28.0% |
| Garrison, ND | 1,708 | 36 | 28.0% |
| Max, ND | 297 | 36 | 28.0% |
| Douglas, ND | 101 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Whale Pass, AK | 101 | 20 | 60.0% |
| Deer Park, AL | 101 | 42 | 16.0% |
| Maysville, CO | 101 | 16 | 68.0% |
| Hilltop, GA | 101 | 52 | 4.0% |
| Pleasant Plain, IA | 101 | 35 | 30.0% |
| Douglas, ND | 101 | 36 | 28.0% |
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