| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 35°F | 48°F | 41°F | 5.5" |
| February | 36°F | 52°F | 43°F | 3.0" |
| March | 42°F | 58°F | 49°F | 4.6" |
| April | 44°F | 61°F | 51°F | 3.0" |
| May | 49°F | 69°F | 58°F | 3.8" |
| June | 53°F | 71°F | 61°F | 3.1" |
| July | 57°F | 79°F | 67°F | 2.6" |
| August | 56°F | 79°F | 66°F | 3.7" |
| September | 51°F | 70°F | 60°F | 2.8" |
| October | 47°F | 62°F | 53°F | 3.7" |
| November | 39°F | 51°F | 44°F | 6.3" |
| December | 36°F | 47°F | 41°F | 8.2" |
| Index | Bryn Mawr-Skyway | 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. |
| Southworth, WA | 2,300 | 18 | 64.0% |
| Browns Point, WA | 961 | 18 | 64.0% |
| Ruston, WA | 1,329 | 18 | 64.0% |
| Dash Point, WA | 1,008 | 18 | 64.0% |
| Maplewood, WA | 5,135 | 18 | 64.0% |
| Bryn Mawr-Skyway, WA | 17,643 | 45 | 10.0% |
| City | Population | Air Quality Index | National Avg. |
| Santa Fe Springs, CA | 17,643 | 72 | 44.0% |
| Kirksville, MO | 17,645 | 41 | 18.0% |
| Bracebridge, ON | 17,648 | n/a | |
| Macomb, IL | 17,658 | 29 | 42.0% |
| Bay City, TX | 17,672 | 31 | 38.0% |
| Bryn Mawr-Skyway, WA | 17,643 | 45 | 10.0% |
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