| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 6°F | 24°F | 14°F | 2.8" |
| February | 7°F | 26°F | 15°F | 2.4" |
| March | 18°F | 39°F | 26°F | 0.7" |
| April | 28°F | 54°F | 39°F | 1.4" |
| May | 39°F | 65°F | 51°F | 2.7" |
| June | 48°F | 72°F | 59°F | 2.6" |
| July | 54°F | 82°F | 67°F | 1.5" |
| August | 52°F | 80°F | 64°F | 1.7" |
| September | 44°F | 70°F | 55°F | 1.8" |
| October | 31°F | 55°F | 41°F | 1.2" |
| November | 19°F | 39°F | 27°F | 1.0" |
| December | 5°F | 22°F | 13°F | 2.5" |
| Index | Opheim | Montana | National |
| Air quality index | 34 | 34 | 42 |
| Pollution index | 348,172 | 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 | 0.005% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.010% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Opheim, MT | 67 | 34 | 32.0% |
| City | Population | Air Quality Index | National Avg. |
| Zinc, AR | 67 | 36 | 28.0% |
| Washington Park, AZ | 67 | 60 | 20.0% |
| Beaver, IA | 67 | 37 | 26.0% |
| Curlew, IA | 67 | 15 | 70.0% |
| Kinross, IA | 67 | 35 | 30.0% |
| Opheim, MT | 67 | 34 | 32.0% |
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