| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 3°F | 21°F | 12°F | 1.4" |
| February | 4°F | 23°F | 13°F | 1.0" |
| March | 18°F | 39°F | 27°F | 1.4" |
| April | 30°F | 54°F | 41°F | 2.0" |
| May | 42°F | 68°F | 55°F | 4.4" |
| June | 52°F | 76°F | 64°F | 3.8" |
| July | 56°F | 81°F | 68°F | 3.8" |
| August | 51°F | 82°F | 65°F | 3.3" |
| September | 45°F | 70°F | 56°F | 5.2" |
| October | 33°F | 56°F | 43°F | 2.6" |
| November | 18°F | 38°F | 27°F | 1.9" |
| December | 4°F | 22°F | 13°F | 0.9" |
| Index | Tolley | North Dakota | National |
| Air quality index | 34 | 35 | 42 |
| Pollution index | 173,888 | 1,038,665 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 309 |
| Days with moderate air quality | 53 |
| Days w/ poor A.Q. for sensitive groups | 3 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.002% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Grano, ND | 2 | 34 | 32.0% |
| Loraine, ND | 16 | 34 | 32.0% |
| Mohall, ND | 655 | 34 | 32.0% |
| Kenmare, ND | 987 | 34 | 32.0% |
| Tolley, ND | 18 | 34 | 32.0% |
| City | Population | Air Quality Index | National Avg. |
| Rockville, AL | 18 | 42 | 16.0% |
| Shoshone, CA | 18 | 15 | 70.0% |
| Conejos, CO | 18 | 15 | 70.0% |
| Piedra, CO | 18 | 44 | 12.0% |
| Elkport, IA | 18 | 29 | 42.0% |
| Tolley, ND | 18 | 34 | 32.0% |
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