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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | n/a°F | n/a°F | n/a°F | n/a |
| February | n/a°F | n/a°F | n/a°F | n/a |
| March | n/a°F | n/a°F | n/a°F | n/a |
| April | n/a°F | n/a°F | n/a°F | n/a |
| May | n/a°F | n/a°F | n/a°F | n/a |
| June | n/a°F | n/a°F | n/a°F | n/a |
| July | n/a°F | n/a°F | n/a°F | n/a |
| August | n/a°F | n/a°F | n/a°F | n/a |
| September | n/a°F | n/a°F | n/a°F | n/a |
| October | n/a°F | n/a°F | n/a°F | n/a |
| November | n/a°F | n/a°F | n/a°F | n/a |
| December | n/a°F | n/a°F | n/a°F | n/a |
| Index | Crow Agency | Montana | National |
| Air quality index | 21 | 34 | 42 |
| Pollution index | 562,118 | 834,473 | 2,726,193 |
| Measurement | Total |
| Days measured | 362 |
| Days with good air quality | 357 |
| Days with moderate air quality | 4 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 1 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.002% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Hardin, MT | 3,777 | 21 | 58.0% |
| St. Xavier, MT | 184 | 21 | 58.0% |
| Crow Agency, MT | 1,972 | 21 | 58.0% |
| City | Population | Air Quality Index | National Avg. |
| Catlin, IL | 1,972 | 42 | 16.0% |
| North Hartsville, SC | 1,972 | 40 | 20.0% |
| Jerome, IL | 1,973 | 40 | 20.0% |
| Merrionette Park, IL | 1,973 | 55 | 10.0% |
| Liberty, KY | 1,971 | 40 | 20.0% |
| Crow Agency, MT | 1,972 | 21 | 58.0% |