| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 5°F | 21°F | 12°F | 1.7" |
| February | 8°F | 25°F | 16°F | 0.6" |
| March | 20°F | 41°F | 29°F | 1.1" |
| April | 30°F | 53°F | 40°F | 3.1" |
| May | 45°F | 68°F | 55°F | 4.4" |
| June | 54°F | 77°F | 65°F | 4.1" |
| July | 59°F | 81°F | 69°F | 5.7" |
| August | 57°F | 80°F | 67°F | 5.5" |
| September | 49°F | 72°F | 59°F | 3.5" |
| October | 37°F | 57°F | 45°F | 3.9" |
| November | 22°F | 40°F | 30°F | 0.8" |
| December | 7°F | 22°F | 14°F | 0.8" |
| Index | Velva | 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. |
| Karlsruhe, ND | 56 | 36 | 28.0% |
| Logan, ND | 364 | 36 | 28.0% |
| Sawyer, ND | 278 | 36 | 28.0% |
| Surrey, ND | 1,061 | 36 | 28.0% |
| Voltaire, ND | 45 | 36 | 28.0% |
| Velva, ND | 1,256 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Maxwell, CA | 1,256 | 44 | 12.0% |
| Farmersburg, IN | 1,256 | 45 | 10.0% |
| Barbourmeade, KY | 1,256 | 49 | 2.0% |
| Benton, TN | 1,256 | 1 | 98.0% |
| Las Palmas II, TX | 1,256 | 44 | 12.0% |
| Velva, ND | 1,256 | 36 | 28.0% |
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