| 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 | Sammamish | 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. |
| Fairwood, WA | 19,400 | 45 | 10.0% |
| Cottage Lake, WA | 23,239 | 45 | 10.0% |
| Hobart, WA | 7,031 | 45 | 10.0% |
| Fall City, WA | 2,357 | 45 | 10.0% |
| Esperance, WA | 4,410 | 45 | 10.0% |
| Sammamish, WA | 65,265 | 45 | 10.0% |
| City | Population | Air Quality Index | National Avg. |
| Medicine Hat, AB | 65,247 | n/a | |
| Schenectady, NY | 65,336 | 37 | 26.0% |
| Castle Rock, CO | 65,176 | 58 | 16.0% |
| Jupiter, FL | 65,139 | 36 | 28.0% |
| Bayonne, NJ | 65,112 | 51 | 2.0% |
| Sammamish, WA | 65,265 | 45 | 10.0% |
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