| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 6°F | 24°F | 14°F | 0.3" |
| February | 7°F | 25°F | 15°F | 0.2" |
| March | 19°F | 40°F | 28°F | 0.6" |
| April | 32°F | 56°F | 43°F | 1.2" |
| May | 43°F | 68°F | 55°F | 3.4" |
| June | 54°F | 77°F | 65°F | 4.6" |
| July | 59°F | 85°F | 71°F | 2.3" |
| August | 56°F | 83°F | 69°F | 2.2" |
| September | 48°F | 74°F | 59°F | 2.0" |
| October | 35°F | 56°F | 45°F | 1.2" |
| November | 21°F | 40°F | 30°F | 0.4" |
| December | 7°F | 24°F | 15°F | 0.4" |
| Index | Granville | 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% |
| Surrey, ND | 1,061 | 36 | 28.0% |
| Sawyer, ND | 278 | 36 | 28.0% |
| Velva, ND | 1,256 | 36 | 28.0% |
| Deering, ND | 132 | 36 | 28.0% |
| Granville, ND | 231 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| McGrath, AK | 231 | 31 | 38.0% |
| Carthage, AR | 231 | 32 | 36.0% |
| Homeland, FL | 231 | 36 | 28.0% |
| Lambs Grove, IA | 231 | 39 | 22.0% |
| Ulen, IN | 231 | 54 | 8.0% |
| Granville, ND | 231 | 36 | 28.0% |
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