| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | -4°F | 16°F | 6°F | 11.4" |
| February | -4°F | 17°F | 6°F | 3.4" |
| March | 12°F | 31°F | 21°F | 2.2" |
| April | 27°F | 51°F | 38°F | 1.3" |
| May | 38°F | 65°F | 51°F | 2.8" |
| June | 50°F | 74°F | 61°F | 4.0" |
| July | 53°F | 78°F | 65°F | 2.5" |
| August | 51°F | 78°F | 63°F | 2.6" |
| September | 44°F | 71°F | 56°F | 3.1" |
| October | 31°F | 54°F | 41°F | 0.8" |
| November | 17°F | 36°F | 25°F | 1.2" |
| December | -1°F | 17°F | 8°F | 7.7" |
| Index | Wales | North Dakota | National |
| Air quality index | 33 | 35 | 42 |
| Pollution index | 240,103 | 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 | 0.004% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Hannah, ND | 8 | 33 | 34.0% |
| Langdon, ND | 1,936 | 33 | 34.0% |
| Wales, ND | 9 | 33 | 34.0% |
| City | Population | Air Quality Index | National Avg. |
| Covenant Life, AK | 9 | 20 | 60.0% |
| Stevens Village, AK | 9 | 38 | 24.0% |
| Wiseman, AK | 9 | 38 | 24.0% |
| Berkley, IA | 9 | 37 | 26.0% |
| River Bend, MO | 9 | 47 | 6.0% |
| Wales, ND | 9 | 33 | 34.0% |
Here are the best places to live in North Dakota
These are the largest cities in North Dakota
Check out the 10 safest cities in North Dakota
Safest States In The US