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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 34°F | 46°F | 39°F | 9.0" |
| February | 34°F | 49°F | 40°F | 4.0" |
| March | 36°F | 52°F | 43°F | 4.2" |
| April | 38°F | 58°F | 47°F | 2.9" |
| May | 43°F | 65°F | 53°F | 4.4" |
| June | 49°F | 70°F | 59°F | 3.3" |
| July | 54°F | 79°F | 65°F | 1.9" |
| August | 53°F | 77°F | 64°F | 3.2" |
| September | 49°F | 72°F | 59°F | 3.7" |
| October | 42°F | 60°F | 50°F | 5.2" |
| November | 39°F | 51°F | 44°F | 8.1" |
| December | 32°F | 44°F | 38°F | 6.1" |
| Index | Yelm | Washington | National |
| Air quality index | 30 | 36 | 42 |
| Pollution index | 6,915,950 | 4,541,850 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 323 |
| Days with moderate air quality | 42 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.110% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.000% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Tenino, WA | 1,744 | 20 | 60.0% |
| Bucoda, WA | 608 | 20 | 60.0% |
| Prairie Heights, WA | 4,810 | 30 | 40.0% |
| DuPont, WA | 9,514 | 30 | 40.0% |
| Rainier, WA | 2,603 | 30 | 40.0% |
| Yelm, WA | 9,262 | 30 | 40.0% |
| City | Population | Air Quality Index | National Avg. |
| Bethalto, IL | 9,258 | 54 | 8.0% |
| Indianola, MS | 9,258 | 43 | 14.0% |
| Atmore, AL | 9,269 | 37 | 26.0% |
| Westphalia, MD | 9,269 | 47 | 6.0% |
| Aransas Pass, TX | 9,269 | 42 | 16.0% |
| Yelm, WA | 9,262 | 30 | 40.0% |
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