| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 14°F | 36°F | 24°F | 1.9" |
| February | 16°F | 39°F | 27°F | 1.0" |
| March | 24°F | 50°F | 36°F | 1.0" |
| April | 31°F | 59°F | 44°F | 2.1" |
| May | 38°F | 66°F | 52°F | 3.3" |
| June | 46°F | 78°F | 62°F | 3.0" |
| July | 53°F | 86°F | 69°F | 5.0" |
| August | 51°F | 83°F | 66°F | 6.3" |
| September | 42°F | 72°F | 56°F | 3.5" |
| October | 34°F | 62°F | 47°F | 3.0" |
| November | 22°F | 46°F | 33°F | 1.8" |
| December | 12°F | 35°F | 23°F | 1.0" |
| Index | Denton | Montana | National |
| Air quality index | 21 | 34 | 42 |
| Pollution index | 133,005 | 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 | 0.002% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Stanford, MT | 260 | 21 | 58.0% |
| Denton, MT | 239 | 21 | 58.0% |
| City | Population | Air Quality Index | National Avg. |
| Upper Kalskag, AK | 239 | 31 | 38.0% |
| Bakerhill, AL | 239 | 35 | 30.0% |
| Fredonia (Biscoe), AR | 239 | 45 | 10.0% |
| Cushing, IA | 239 | 35 | 30.0% |
| Metcalf, IL | 239 | 45 | 10.0% |
| Denton, MT | 239 | 21 | 58.0% |
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