| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 23°F | 33°F | 27°F | 12.2" |
| February | 26°F | 35°F | 30°F | 7.2" |
| March | 29°F | 39°F | 33°F | 11.1" |
| April | 32°F | 46°F | 37°F | 6.3" |
| May | 39°F | 55°F | 45°F | 5.8" |
| June | 43°F | 60°F | 49°F | 4.4" |
| July | 49°F | 70°F | 57°F | 1.2" |
| August | 51°F | 70°F | 58°F | 1.5" |
| September | 46°F | 63°F | 52°F | 4.1" |
| October | 38°F | 50°F | 42°F | 9.1" |
| November | 30°F | 37°F | 33°F | 14.5" |
| December | 23°F | 31°F | 26°F | 12.2" |
| Index | Skykomish | Washington | National |
| Air quality index | 45 | 36 | 42 |
| Pollution index | 422,626 | 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 | 0.001% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Baring, WA | 205 | 45 | 10.0% |
| Index, WA | 172 | 45 | 10.0% |
| May Creek, WA | 759 | 45 | 10.0% |
| Skykomish, WA | 127 | 45 | 10.0% |
| City | Population | Air Quality Index | National Avg. |
| Goodnews Bay, AK | 127 | 31 | 38.0% |
| Delaplaine, AR | 127 | 26 | 48.0% |
| Divide, CO | 127 | 45 | 10.0% |
| Seven Hills, CO | 127 | 47 | 6.0% |
| Springbrook, IA | 127 | 42 | 16.0% |
| Skykomish, WA | 127 | 45 | 10.0% |
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