| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 18°F | 34°F | 25°F | n/a |
| February | 19°F | 35°F | 26°F | n/a |
| March | 25°F | 43°F | 33°F | n/a |
| April | 28°F | 49°F | 37°F | n/a |
| May | 35°F | 58°F | 45°F | n/a |
| June | 42°F | 72°F | 57°F | n/a |
| July | 47°F | 78°F | 62°F | n/a |
| August | 45°F | 75°F | 60°F | n/a |
| September | 40°F | 66°F | 51°F | n/a |
| October | 33°F | 53°F | 41°F | n/a |
| November | 23°F | 40°F | 30°F | n/a |
| December | 14°F | 31°F | 22°F | n/a |
| Index | Dubois | Wyoming | National |
| Air quality index | 43 | 39 | 42 |
| Pollution index | 270,167 | 1,779,975 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 326 |
| Days with moderate air quality | 39 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| 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. |
| Dubois, WY | 769 | 43 | 14.0% |
| City | Population | Air Quality Index | National Avg. |
| Potomac, IL | 769 | 42 | 16.0% |
| Twin Valley, MN | 769 | 33 | 34.0% |
| Ulm, MT | 769 | 21 | 58.0% |
| Old Fort, NC | 769 | 44 | 12.0% |
| Sycamore, OH | 769 | 39 | 22.0% |
| Dubois, WY | 769 | 43 | 14.0% |