| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 34°F | 48°F | 40°F | 5.4" |
| February | 36°F | 52°F | 43°F | 3.7" |
| March | 39°F | 57°F | 47°F | 4.9" |
| April | 42°F | 63°F | 52°F | 2.9" |
| May | 48°F | 71°F | 58°F | 2.6" |
| June | 53°F | 76°F | 63°F | 1.7" |
| July | 57°F | 84°F | 69°F | 0.5" |
| August | 57°F | 84°F | 69°F | 0.4" |
| September | 52°F | 79°F | 64°F | 1.5" |
| October | 46°F | 66°F | 55°F | 3.7" |
| November | 40°F | 54°F | 47°F | 6.2" |
| December | 34°F | 47°F | 40°F | 6.2" |
| Index | Fishers Landing East | Vancouver | Washington |
| Air quality index | 38 | 38 | 36 |
| Pollution index | 1,899,410 | 1,899,410 | 4,541,850 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 285 |
| Days with moderate air quality | 77 |
| Days w/ poor A.Q. for sensitive groups | 3 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.003% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.010% |
| Mercury | 0.002% |
| City | Population | Air Quality Index | National Avg. |
| Maywood Park, OR | 1,224 | 38 | 24.0% |
| Brush Prairie, WA | 2,721 | 38 | 24.0% |
| Lewisville, WA | 2,166 | 38 | 24.0% |
| Washougal, WA | 15,927 | 38 | 24.0% |
| Lake Oswego, OR | 39,476 | 38 | 24.0% |
| Vancouver, WA | 182,792 | 38 | 24.0% |
| City | Population | Air Quality Index | National Avg. |
| Brownsville, TX | 182,230 | 44 | 12.0% |
| Fort Lauderdale, FL | 181,818 | 41 | 18.0% |
| Chattanooga, TN | 181,370 | 46 | 8.0% |
| Sioux Falls, SD | 180,927 | 36 | 28.0% |
| Worcester, MA | 185,186 | 40 | 20.0% |
| Vancouver, WA | 182,792 | 38 | 24.0% |
Here are the best places to live in Washington
10 Best cities in Washington for employment
Top 10 cities in Washington with the best education system
These are the 10 most affordable cities in Washington