| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 34°F | 47°F | 39°F | 8.0" |
| February | 33°F | 51°F | 40°F | 3.6" |
| March | 36°F | 54°F | 44°F | 4.7" |
| April | 38°F | 58°F | 47°F | 3.1" |
| May | 44°F | 66°F | 54°F | 3.9" |
| June | 49°F | 70°F | 58°F | 3.1" |
| July | 53°F | 79°F | 65°F | 2.0" |
| August | 53°F | 78°F | 64°F | 2.9" |
| September | 48°F | 72°F | 59°F | 3.9" |
| October | 43°F | 61°F | 50°F | 4.5" |
| November | 38°F | 51°F | 44°F | 8.3" |
| December | 32°F | 45°F | 38°F | 6.6" |
| Index | Mineral | Washington | National |
| Air quality index | 20 | 36 | 42 |
| Pollution index | 6,915,950 | 4,541,850 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 343 |
| Days with moderate air quality | 22 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.110% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.000% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Alder, WA | 134 | 20 | 60.0% |
| Mossyrock, WA | 666 | 20 | 60.0% |
| Elbe, WA | 46 | 20 | 60.0% |
| Morton, WA | 1,111 | 20 | 60.0% |
| Ashford, WA | 489 | 20 | 60.0% |
| Mineral, WA | 135 | 20 | 60.0% |
| City | Population | Air Quality Index | National Avg. |
| Atqasuk, AK | 135 | 38 | 24.0% |
| Fort Greely, AK | 135 | 38 | 24.0% |
| Mono City, CA | 135 | 47 | 6.0% |
| San Acacio, CO | 135 | 15 | 70.0% |
| Mount Union, IA | 135 | 32 | 36.0% |
| Mineral, WA | 135 | 20 | 60.0% |
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