| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 35°F | 48°F | 42°F | 5.6" |
| February | 37°F | 51°F | 43°F | 3.7" |
| March | 39°F | 55°F | 46°F | 5.1" |
| April | 42°F | 60°F | 50°F | 3.2" |
| May | 47°F | 68°F | 56°F | 2.2" |
| June | 52°F | 72°F | 61°F | 1.5" |
| July | 56°F | 80°F | 66°F | 0.6" |
| August | 56°F | 80°F | 66°F | 1.1" |
| September | 53°F | 73°F | 61°F | 1.9" |
| October | 46°F | 62°F | 53°F | 4.5" |
| November | 40°F | 53°F | 46°F | 7.1" |
| December | 35°F | 47°F | 41°F | 6.1" |
| Index | Enumclaw | Washington | National |
| Air quality index | 45 | 36 | 42 |
| Pollution index | 17,693,800 | 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 | 0.010% |
| Benzene | 0.300% |
| Carbon Tetrachloride | 0.050% |
| Lead | 0.110% |
| Mercury | 0.020% |
| City | Population | Air Quality Index | National Avg. |
| Graham, WA | 32,505 | 30 | 40.0% |
| McMillin, WA | 1,236 | 30 | 40.0% |
| Puyallup, WA | 41,666 | 30 | 40.0% |
| Orting, WA | 8,267 | 30 | 40.0% |
| Crocker, WA | 1,322 | 30 | 40.0% |
| Enumclaw, WA | 12,062 | 45 | 10.0% |
| City | Population | Air Quality Index | National Avg. |
| Overlea, MD | 12,063 | 46 | 8.0% |
| Scotts Valley, CA | 12,055 | 35 | 30.0% |
| Festus, MO | 12,054 | 54 | 8.0% |
| Port Salerno, FL | 12,070 | 36 | 28.0% |
| Londonderry, NH | 12,053 | 37 | 26.0% |
| Enumclaw, WA | 12,062 | 45 | 10.0% |
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