| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 3°F | 22°F | 12°F | 0.2" |
| February | 5°F | 24°F | 13°F | 0.3" |
| March | 19°F | 39°F | 27°F | 0.7" |
| April | 31°F | 56°F | 42°F | 1.3" |
| May | 43°F | 68°F | 55°F | 3.8" |
| June | 55°F | 78°F | 65°F | 3.9" |
| July | 59°F | 84°F | 71°F | 2.6" |
| August | 56°F | 81°F | 67°F | 2.7" |
| September | 48°F | 73°F | 59°F | 2.5" |
| October | 36°F | 57°F | 45°F | 1.8" |
| November | 21°F | 41°F | 30°F | 0.5" |
| December | 6°F | 23°F | 15°F | 0.4" |
| Index | Leal | North Dakota | National |
| Air quality index | 33 | 35 | 42 |
| Pollution index | 390,891 | 1,038,665 | 2,726,193 |
| Measurement | Total |
| Days measured | 363 |
| Days with good air quality | 327 |
| Days with moderate air quality | 34 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 1 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.003% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Dazey, ND | 51 | 33 | 34.0% |
| Spiritwood, ND | 0 | 33 | 34.0% |
| Hannaford, ND | 101 | 33 | 34.0% |
| Spiritwood Lake, ND | 142 | 33 | 34.0% |
| Courtenay, ND | 60 | 33 | 34.0% |
| Leal, ND | 11 | 33 | 34.0% |
| City | Population | Air Quality Index | National Avg. |
| Oljato-Monument Valley, AZ | 11 | 49 | 2.0% |
| Wintersburg, AZ | 11 | 74 | 48.0% |
| Cuyama, CA | 11 | 44 | 12.0% |
| Cathedral, CO | 11 | 44 | 12.0% |
| Bankston, IA | 11 | 29 | 42.0% |
| Leal, ND | 11 | 33 | 34.0% |
Here are the best places to live in North Dakota
Check out the 10 safest cities in North Dakota
Top 10 cities in North Dakota with the best education system
10 Best cities in North Dakota for employment