| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 13°F | 35°F | 24°F | 1.1" |
| February | 15°F | 40°F | 27°F | 0.6" |
| March | 22°F | 51°F | 35°F | 1.5" |
| April | 27°F | 57°F | 41°F | 3.3" |
| May | 37°F | 66°F | 51°F | 3.4" |
| June | 44°F | 76°F | 60°F | 3.5" |
| July | 50°F | 86°F | 68°F | 2.0" |
| August | 47°F | 83°F | 65°F | 3.5" |
| September | 39°F | 71°F | 54°F | 4.9" |
| October | 30°F | 60°F | 44°F | 1.5" |
| November | 20°F | 44°F | 31°F | 1.4" |
| December | 8°F | 32°F | 20°F | 0.9" |
| Index | Dutton | Montana | National |
| Air quality index | 21 | 34 | 42 |
| Pollution index | 260,100 | 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 | 0.004% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.002% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Brady, MT | 74 | 21 | 58.0% |
| Power, MT | 153 | 21 | 58.0% |
| Dutton, MT | 224 | 21 | 58.0% |
| City | Population | Air Quality Index | National Avg. |
| Brookside, CO | 224 | 16 | 68.0% |
| Jansen, CO | 224 | 20 | 60.0% |
| Ebro, FL | 224 | 38 | 24.0% |
| Victoria, IL | 224 | 41 | 18.0% |
| Ewing, KY | 224 | 42 | 16.0% |
| Dutton, MT | 224 | 21 | 58.0% |
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