| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 4°F | 21°F | 13°F | 1.2" |
| February | 6°F | 25°F | 15°F | 1.0" |
| March | 16°F | 38°F | 26°F | 1.0" |
| April | 27°F | 52°F | 38°F | 2.5" |
| May | 42°F | 69°F | 55°F | 6.0" |
| June | 52°F | 78°F | 64°F | 3.4" |
| July | 56°F | 82°F | 68°F | 4.6" |
| August | 53°F | 81°F | 66°F | 4.4" |
| September | 46°F | 73°F | 58°F | 3.7" |
| October | 33°F | 56°F | 43°F | 3.2" |
| November | 18°F | 40°F | 28°F | 0.8" |
| December | 4°F | 24°F | 14°F | 0.6" |
| Index | Underwood | 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. |
| Pick City, ND | 120 | 36 | 28.0% |
| Washburn, ND | 1,361 | 36 | 28.0% |
| Riverdale, ND | 192 | 36 | 28.0% |
| Garrison, ND | 1,708 | 36 | 28.0% |
| Stanton, ND | 397 | 36 | 28.0% |
| Underwood, ND | 768 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Unalakleet, AK | 768 | 38 | 24.0% |
| London, AR | 768 | 38 | 24.0% |
| Hana, HI | 768 | 15 | 70.0% |
| Ashland, KS | 768 | 15 | 70.0% |
| Kevil, KY | 768 | 44 | 12.0% |
| Underwood, ND | 768 | 36 | 28.0% |
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