| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 3°F | 27°F | 14°F | 0.5" |
| February | 5°F | 29°F | 16°F | 0.6" |
| March | 17°F | 45°F | 30°F | 0.7" |
| April | 29°F | 60°F | 43°F | 1.1" |
| May | 39°F | 70°F | 54°F | 2.7" |
| June | 49°F | 80°F | 64°F | 2.6" |
| July | 56°F | 89°F | 72°F | 2.1" |
| August | 53°F | 87°F | 69°F | 1.5" |
| September | 43°F | 77°F | 59°F | 1.6" |
| October | 31°F | 60°F | 44°F | 1.2" |
| November | 18°F | 43°F | 29°F | 0.7" |
| December | 4°F | 27°F | 15°F | 0.8" |
| Index | Froid | Montana | National |
| Air quality index | 34 | 34 | 42 |
| Pollution index | 563,599 | 834,473 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 309 |
| Days with moderate air quality | 53 |
| Days w/ poor A.Q. for sensitive groups | 3 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.010% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Medicine Lake, MT | 183 | 34 | 32.0% |
| Bainville, MT | 159 | 34 | 32.0% |
| Culbertson, MT | 665 | 34 | 32.0% |
| Froid, MT | 384 | 34 | 32.0% |
| City | Population | Air Quality Index | National Avg. |
| Plainville, GA | 384 | 44 | 12.0% |
| Woodland, GA | 384 | 42 | 16.0% |
| Pierce, ID | 384 | 29 | 42.0% |
| Monroe Center, IL | 384 | 42 | 16.0% |
| Olivet, IL | 384 | 45 | 10.0% |
| Froid, MT | 384 | 34 | 32.0% |
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