| 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 | Nisqually Indian Community | Washington | National |
| Air quality index | 30 | 36 | 42 |
| Pollution index | 6,704,330 | 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 | 0.003% |
| Benzene | 0.100% |
| Carbon Tetrachloride | 0.004% |
| Lead | 0.030% |
| Mercury | 0.003% |
| City | Population | Air Quality Index | National Avg. |
| Tenino, WA | 1,807 | 20 | 60.0% |
| Fircrest, WA | 7,059 | 30 | 40.0% |
| McKenna, WA | 644 | 30 | 40.0% |
| Lacey, WA | 52,421 | 30 | 40.0% |
| DuPont, WA | 9,807 | 30 | 40.0% |
| Nisqually Indian Community, WA | 603 | 30 | 40.0% |
| City | Population | Air Quality Index | National Avg. |
| Avalon, FL | 603 | 41 | 18.0% |
| East Galesburg, IL | 603 | 41 | 18.0% |
| Arlington, KS | 603 | 40 | 20.0% |
| LeRoy, KS | 603 | 22 | 56.0% |
| Benham, KY | 603 | 45 | 10.0% |
| Nisqually Indian Community, WA | 603 | 30 | 40.0% |