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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 36°F | 49°F | 42°F | 5.1" |
| February | 37°F | 52°F | 44°F | 3.8" |
| March | 40°F | 55°F | 47°F | 4.9" |
| April | 43°F | 61°F | 51°F | 3.1" |
| May | 49°F | 68°F | 57°F | 2.2" |
| June | 54°F | 72°F | 62°F | 1.5" |
| July | 58°F | 79°F | 67°F | 0.4" |
| August | 58°F | 79°F | 68°F | 0.6" |
| September | 54°F | 73°F | 62°F | 1.6" |
| October | 47°F | 62°F | 54°F | 3.9" |
| November | 40°F | 53°F | 47°F | 6.6" |
| December | 36°F | 48°F | 41°F | 6.1" |
| Index | Kirkland | Washington | National |
| Air quality index | 45 | 36 | 42 |
| Pollution index | 43,367,400 | 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 | 0.020% |
| Benzene | 0.790% |
| Carbon Tetrachloride | 0.120% |
| Lead | 0.210% |
| Mercury | 0.180% |
| City | Population | Air Quality Index | National Avg. |
| Chain Lake, WA | 5,237 | 45 | 10.0% |
| Issaquah, WA | 38,707 | 45 | 10.0% |
| Boulevard Park, WA | 4,197 | 45 | 10.0% |
| Mukilteo, WA | 21,414 | 45 | 10.0% |
| Shoreline, WA | 56,835 | 45 | 10.0% |
| Kirkland, WA | 91,146 | 45 | 10.0% |
| City | Population | Air Quality Index | National Avg. |
| Carson, CA | 91,354 | 72 | 44.0% |
| Santa Barbara, CA | 90,911 | 44 | 12.0% |
| Suffolk, VA | 91,383 | 40 | 20.0% |
| Westminster, CA | 90,857 | 72 | 44.0% |
| Tracy, CA | 91,462 | 45 | 10.0% |
| Kirkland, WA | 91,146 | 45 | 10.0% |
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