| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 33°F | 46°F | 39°F | 3.0" |
| February | 34°F | 50°F | 41°F | 1.7" |
| March | 37°F | 54°F | 45°F | 3.4" |
| April | 40°F | 59°F | 48°F | 2.0" |
| May | 45°F | 65°F | 54°F | 2.4" |
| June | 49°F | 70°F | 59°F | 1.9" |
| July | 52°F | 77°F | 63°F | 1.3" |
| August | 52°F | 78°F | 63°F | 1.4" |
| September | 49°F | 71°F | 58°F | 2.4" |
| October | 43°F | 60°F | 50°F | 3.4" |
| November | 37°F | 52°F | 44°F | 4.0" |
| December | 32°F | 44°F | 38°F | 3.1" |
| Index | Stanwood | Washington | National |
| Air quality index | 24 | 36 | 42 |
| Pollution index | 15,778,900 | 4,541,850 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 361 |
| 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 | 0.270% |
| Carbon Tetrachloride | 0.040% |
| Lead | 0.160% |
| Mercury | 0.003% |
| City | Population | Air Quality Index | National Avg. |
| Arlington Heights, WA | 2,463 | 24 | 52.0% |
| Camano, WA | 17,073 | 24 | 52.0% |
| Arlington, WA | 19,947 | 24 | 52.0% |
| North Marysville, WA | 138 | 24 | 52.0% |
| Bryant, WA | 2,142 | 24 | 52.0% |
| Stanwood, WA | 7,228 | 24 | 52.0% |
| City | Population | Air Quality Index | National Avg. |
| Ridgefield, CT | 7,228 | 43 | 14.0% |
| Wauseon, OH | 7,229 | 39 | 22.0% |
| Otonabee-South Monaghan, ON | 7,229 | n/a | |
| Canfield, OH | 7,226 | 42 | 16.0% |
| Rocky Mountain House, AB | 7,226 | n/a | |
| Stanwood, WA | 7,228 | 24 | 52.0% |
Here are the best places to live in Washington
Check out the 10 safest cities in Washington
These are the 10 cheapest cities in Washington
These are the largest cities in Washington