| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 0°F | 22°F | 10°F | 1.4" |
| February | 6°F | 24°F | 14°F | 0.6" |
| March | 21°F | 42°F | 30°F | 2.3" |
| April | 31°F | 57°F | 43°F | 2.7" |
| May | 43°F | 66°F | 53°F | 9.0" |
| June | 54°F | 75°F | 64°F | 9.3" |
| July | 59°F | 85°F | 71°F | 3.0" |
| August | 53°F | 82°F | 66°F | 3.6" |
| September | 46°F | 75°F | 58°F | 3.9" |
| October | 35°F | 57°F | 45°F | 0.5" |
| November | 23°F | 41°F | 31°F | 2.1" |
| December | 8°F | 26°F | 17°F | 2.6" |
| Index | Garrison | North Dakota | National |
| Air quality index | 36 | 35 | 42 |
| Pollution index | 10,956,300 | 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 | 0.390% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.100% |
| Mercury | 0.250% |
| City | Population | Air Quality Index | National Avg. |
| Max, ND | 297 | 36 | 28.0% |
| Underwood, ND | 768 | 36 | 28.0% |
| Coleharbor, ND | 91 | 36 | 28.0% |
| Pick City, ND | 120 | 36 | 28.0% |
| Douglas, ND | 101 | 36 | 28.0% |
| Garrison, ND | 1,708 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Delavan, IL | 1,708 | 41 | 18.0% |
| Mancelona, MI | 1,708 | 36 | 28.0% |
| Rawls Springs, MS | 1,708 | 35 | 30.0% |
| Santa Clara, NM | 1,708 | 37 | 26.0% |
| Langham, SK | 1,708 | n/a | |
| Garrison, ND | 1,708 | 36 | 28.0% |
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