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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 13°F | 35°F | 24°F | 0.6" |
| February | 18°F | 41°F | 28°F | 0.7" |
| March | 25°F | 52°F | 38°F | 0.5" |
| April | 31°F | 60°F | 44°F | 0.9" |
| May | 39°F | 69°F | 53°F | 1.8" |
| June | 47°F | 79°F | 63°F | 2.0" |
| July | 55°F | 91°F | 73°F | 0.7" |
| August | 52°F | 88°F | 69°F | 1.1" |
| September | 44°F | 77°F | 59°F | 1.1" |
| October | 34°F | 62°F | 46°F | 0.8" |
| November | 23°F | 47°F | 34°F | 0.8" |
| December | 12°F | 33°F | 22°F | 0.8" |
| Index | Clancy | Montana | National |
| Air quality index | 40 | 34 | 42 |
| Pollution index | 1,148,190 | 834,473 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 288 |
| Days with moderate air quality | 75 |
| Days w/ poor A.Q. for sensitive groups | 2 |
| 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. |
| Spokane Creek, MT | 438 | 40 | 20.0% |
| East Helena, MT | 1,684 | 40 | 20.0% |
| Helena West Side, MT | 1,656 | 40 | 20.0% |
| Basin, MT | 267 | 40 | 20.0% |
| Helena, MT | 32,655 | 40 | 20.0% |
| Clancy, MT | 1,964 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| Hillsboro Beach, FL | 1,964 | 41 | 18.0% |
| Peosta, IA | 1,964 | 29 | 42.0% |
| Salyersville, KY | 1,964 | 42 | 16.0% |
| Brownlee Park, MI | 1,964 | 38 | 24.0% |
| Columbus, MT | 1,964 | 21 | 58.0% |
| Clancy, MT | 1,964 | 40 | 20.0% |
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