| 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 | Montpelier | North Dakota | National |
| Air quality index | 33 | 35 | 42 |
| Pollution index | 718,672 | 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 | 0.010% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Jud, ND | 70 | 20 | 60.0% |
| Dickey, ND | 31 | 20 | 60.0% |
| Jamestown, ND | 15,216 | 33 | 34.0% |
| Marion, ND | 181 | 33 | 34.0% |
| Ypsilanti, ND | 28 | 33 | 34.0% |
| Montpelier, ND | 86 | 33 | 34.0% |
| City | Population | Air Quality Index | National Avg. |
| Lake City, CA | 86 | 29 | 42.0% |
| Climbing Hill, IA | 86 | 35 | 30.0% |
| Bingham, IL | 86 | 40 | 20.0% |
| Maple City, MI | 86 | 36 | 28.0% |
| Lake Henry, MN | 86 | 32 | 36.0% |
| Montpelier, ND | 86 | 33 | 34.0% |
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