| 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 | Marysville | 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. |
| Lake Bosworth, WA | 1,071 | 24 | 52.0% |
| Silvana, WA | 14 | 24 | 52.0% |
| Bryant, WA | 2,142 | 24 | 52.0% |
| Northwest Stanwood, WA | 79 | 24 | 52.0% |
| Canyon Creek, WA | 3,218 | 24 | 52.0% |
| Marysville, WA | 69,629 | 24 | 52.0% |
| City | Population | Air Quality Index | National Avg. |
| Lynwood, CA | 69,625 | 72 | 44.0% |
| Greenville, SC | 69,648 | 46 | 8.0% |
| Glen Burnie, MD | 69,649 | 46 | 8.0% |
| Granby, QC | 69,530 | n/a | |
| Grande Prairie, AB | 69,512 | n/a | |
| Marysville, WA | 69,629 | 24 | 52.0% |
Here are the best places to live in Washington
Most Dangerous States In The US
See the best places to live in Marysville
Check out the 10 safest cities in Washington