| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 17°F | 39°F | 27°F | 0.5" |
| February | 19°F | 43°F | 29°F | 0.5" |
| March | 27°F | 54°F | 39°F | 1.1" |
| April | 34°F | 61°F | 46°F | 1.7" |
| May | 42°F | 70°F | 55°F | 3.0" |
| June | 51°F | 81°F | 65°F | 1.7" |
| July | 59°F | 92°F | 75°F | 0.9" |
| August | 56°F | 89°F | 72°F | 1.0" |
| September | 48°F | 79°F | 62°F | 1.6" |
| October | 38°F | 63°F | 49°F | 1.7" |
| November | 27°F | 50°F | 37°F | 0.8" |
| December | 16°F | 36°F | 25°F | 0.9" |
| Index | Bridger | Montana | National |
| Air quality index | 21 | 34 | 42 |
| Pollution index | 218,962 | 834,473 | 2,726,193 |
| Measurement | Total |
| Days measured | 362 |
| Days with good air quality | 357 |
| Days with moderate air quality | 4 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 1 |
| 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. |
| Roberts, MT | 298 | 21 | 58.0% |
| Bridger CDP, MT | 20 | 21 | 58.0% |
| Edgar, MT | 148 | 21 | 58.0% |
| Bearcreek, MT | 144 | 21 | 58.0% |
| Fromberg, MT | 395 | 21 | 58.0% |
| Bridger, MT | 917 | 21 | 58.0% |
| City | Population | Air Quality Index | National Avg. |
| Seville, FL | 917 | 31 | 38.0% |
| Americus, KS | 917 | 22 | 56.0% |
| Auxier, KY | 917 | 42 | 16.0% |
| Pineville, MO | 917 | 38 | 24.0% |
| Owensville, OH | 917 | 54 | 8.0% |
| Bridger, MT | 917 | 21 | 58.0% |
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