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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 15°F | 36°F | 25°F | 1.0" |
| February | 17°F | 38°F | 27°F | 1.0" |
| March | 24°F | 48°F | 35°F | 1.3" |
| April | 31°F | 57°F | 43°F | 1.9" |
| May | 38°F | 64°F | 51°F | 4.9" |
| June | 46°F | 75°F | 60°F | 3.7" |
| July | 52°F | 84°F | 68°F | 2.4" |
| August | 52°F | 83°F | 67°F | 2.0" |
| September | 43°F | 70°F | 56°F | 4.8" |
| October | 33°F | 60°F | 46°F | 2.5" |
| November | 24°F | 46°F | 34°F | 0.9" |
| December | 12°F | 31°F | 22°F | 1.0" |
| Index | Augusta | Montana | National |
| Air quality index | 21 | 34 | 42 |
| Pollution index | 1,148,190 | 834,473 | 2,726,193 |
| Measurement | Total |
| Days measured | 363 |
| Days with good air quality | 350 |
| Days with moderate air quality | 12 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.010% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Augusta, MT | 238 | 21 | 58.0% |
| City | Population | Air Quality Index | National Avg. |
| Edwardsville, AL | 238 | 43 | 14.0% |
| Magness, AR | 238 | 45 | 10.0% |
| Dripping Springs, AZ | 238 | 47 | 6.0% |
| Blencoe, IA | 238 | 35 | 30.0% |
| Luana, IA | 238 | 35 | 30.0% |
| Augusta, MT | 238 | 21 | 58.0% |
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