| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 35°F | 47°F | 40°F | 8.3" |
| February | 36°F | 52°F | 42°F | 5.4" |
| March | 40°F | 56°F | 46°F | 6.0" |
| April | 41°F | 62°F | 50°F | 4.8" |
| May | 47°F | 69°F | 56°F | 5.7" |
| June | 52°F | 73°F | 60°F | 3.6" |
| July | 55°F | 80°F | 65°F | 2.1" |
| August | 55°F | 81°F | 66°F | 2.8" |
| September | 51°F | 75°F | 61°F | 5.1" |
| October | 46°F | 63°F | 53°F | 6.4" |
| November | 40°F | 52°F | 45°F | 8.2" |
| December | 35°F | 45°F | 39°F | 8.9" |
| Index | Mossyrock | Washington | National |
| Air quality index | 20 | 36 | 42 |
| Pollution index | 4,215,410 | 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 | 0.005% |
| Benzene | 0.050% |
| Carbon Tetrachloride | 0.004% |
| Lead | 0.030% |
| Mercury | 0.250% |
| City | Population | Air Quality Index | National Avg. |
| Mineral, WA | 135 | 20 | 60.0% |
| Morton, WA | 1,111 | 20 | 60.0% |
| Onalaska, WA | 431 | 20 | 60.0% |
| Mossyrock, WA | 666 | 20 | 60.0% |
| City | Population | Air Quality Index | National Avg. |
| Western Grove, AR | 666 | 36 | 28.0% |
| Sky Valley, GA | 666 | 41 | 18.0% |
| Pilot Grove, MO | 666 | 38 | 24.0% |
| Portland, ND | 666 | 33 | 34.0% |
| Mount Victory, OH | 666 | 39 | 22.0% |
| Mossyrock, WA | 666 | 20 | 60.0% |
Here are the best places to live in Washington
See the best places to live in Mossyrock
Check out the 10 most dangerous cities in Washington
Safest States In The US