| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 37°F | 49°F | 42°F | 10.5" |
| February | 38°F | 51°F | 44°F | 6.3" |
| March | 40°F | 53°F | 46°F | 9.8" |
| April | 42°F | 57°F | 49°F | 5.4" |
| May | 47°F | 62°F | 53°F | 3.4" |
| June | 51°F | 65°F | 57°F | 1.8" |
| July | 53°F | 69°F | 60°F | 0.9" |
| August | 54°F | 70°F | 60°F | 1.0" |
| September | 51°F | 69°F | 59°F | 2.7" |
| October | 46°F | 61°F | 53°F | 7.6" |
| November | 41°F | 53°F | 46°F | 12.6" |
| December | 36°F | 47°F | 41°F | 10.1" |
| Index | Willapa | Washington | National |
| Air quality index | 20 | 36 | 42 |
| Pollution index | 2,873,390 | 4,541,850 | 2,726,193 |
| Measurement | Total |
| Days measured | 352 |
| Days with good air quality | 348 |
| Days with moderate air quality | 4 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.050% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.010% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Raymond, WA | 2,970 | 20 | 60.0% |
| South Bend, WA | 1,620 | 20 | 60.0% |
| Lebam, WA | 69 | 20 | 60.0% |
| Bay Center, WA | 152 | 20 | 60.0% |
| Willapa, WA | 122 | 20 | 60.0% |
| City | Population | Air Quality Index | National Avg. |
| Nunam Iqua, AK | 122 | 31 | 38.0% |
| Pollard, AL | 122 | 41 | 18.0% |
| Pineville, AR | 122 | 36 | 28.0% |
| Whispering Pines, AZ | 122 | 60 | 20.0% |
| Gay, GA | 122 | 42 | 16.0% |
| Willapa, WA | 122 | 20 | 60.0% |
Here are the best places to live in Washington
Check out the 10 safest cities in Washington
See the best places to live in Willapa
These are the 10 cheapest cities in Washington