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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 35°F | 48°F | 42°F | 5.6" |
| February | 37°F | 51°F | 43°F | 3.7" |
| March | 39°F | 55°F | 46°F | 5.1" |
| April | 42°F | 60°F | 50°F | 3.2" |
| May | 47°F | 68°F | 56°F | 2.2" |
| June | 52°F | 72°F | 61°F | 1.5" |
| July | 56°F | 80°F | 66°F | 0.6" |
| August | 56°F | 80°F | 66°F | 1.1" |
| September | 53°F | 73°F | 61°F | 1.9" |
| October | 46°F | 62°F | 53°F | 4.5" |
| November | 40°F | 53°F | 46°F | 7.1" |
| December | 35°F | 47°F | 41°F | 6.1" |
| Index | Tukwila | Washington | National |
| Air quality index | 45 | 36 | 42 |
| Pollution index | 1,081,430 | 4,541,850 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 236 |
| Days with moderate air quality | 127 |
| Days w/ poor A.Q. for sensitive groups | 2 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Browns Point, WA | 961 | 18 | 64.0% |
| Ruston, WA | 1,329 | 18 | 64.0% |
| Dash Point, WA | 1,008 | 18 | 64.0% |
| Manchester, WA | 6,050 | 18 | 64.0% |
| Wollochet, WA | 7,193 | 18 | 64.0% |
| Tukwila, WA | 20,265 | 45 | 10.0% |
| City | Population | Air Quality Index | National Avg. |
| Agoura Hills, CA | 20,269 | 72 | 44.0% |
| Rolla, MO | 20,273 | 39 | 22.0% |
| American Canyon, CA | 20,256 | 40 | 20.0% |
| Rosamond, CA | 20,255 | 67 | 34.0% |
| Columbia Heights, MN | 20,247 | 46 | 8.0% |
| Tukwila, WA | 20,265 | 45 | 10.0% |
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