| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 36°F | 48°F | 41°F | 4.7" |
| February | 37°F | 51°F | 44°F | 3.2" |
| March | 40°F | 55°F | 46°F | 4.5" |
| April | 43°F | 61°F | 50°F | 2.9" |
| May | 48°F | 68°F | 57°F | 2.1" |
| June | 53°F | 73°F | 62°F | 1.6" |
| July | 58°F | 80°F | 67°F | 0.5" |
| August | 58°F | 80°F | 67°F | 0.9" |
| September | 53°F | 73°F | 62°F | 1.8" |
| October | 47°F | 62°F | 53°F | 3.9" |
| November | 40°F | 53°F | 46°F | 5.7" |
| December | 36°F | 47°F | 41°F | 4.5" |
| Index | Renton | 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% |
| Dash Point, WA | 1,008 | 18 | 64.0% |
| Ruston, WA | 1,329 | 18 | 64.0% |
| Beaux Arts Village, WA | 396 | 45 | 10.0% |
| Kent, WA | 130,038 | 45 | 10.0% |
| Renton, WA | 101,871 | 45 | 10.0% |
| City | Population | Air Quality Index | National Avg. |
| Davenport, IA | 102,199 | 46 | 8.0% |
| Nanaimo, BC | 101,513 | n/a | |
| Kamloops, BC | 101,505 | n/a | |
| Lethbridge, AB | 101,384 | n/a | |
| South Bend, IN | 102,686 | 42 | 16.0% |
| Renton, WA | 101,871 | 45 | 10.0% |
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