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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 32°F | 47°F | 39°F | 7.3" |
| February | 32°F | 51°F | 41°F | 4.8" |
| March | 35°F | 55°F | 44°F | 7.0" |
| April | 36°F | 61°F | 48°F | 3.5" |
| May | 42°F | 68°F | 55°F | 2.7" |
| June | 47°F | 73°F | 59°F | 1.5" |
| July | 50°F | 80°F | 64°F | 0.6" |
| August | 50°F | 81°F | 64°F | 1.0" |
| September | 46°F | 74°F | 59°F | 2.5" |
| October | 41°F | 62°F | 51°F | 5.5" |
| November | 35°F | 52°F | 44°F | 9.7" |
| December | 31°F | 46°F | 38°F | 8.0" |
| Index | Tumwater | 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. |
| Rochester, WA | 4,854 | 20 | 60.0% |
| Oakville, WA | 647 | 20 | 60.0% |
| Bucoda, WA | 608 | 20 | 60.0% |
| Tenino, WA | 1,744 | 20 | 60.0% |
| Grand Mound, WA | 3,957 | 20 | 60.0% |
| Tumwater, WA | 23,390 | 30 | 40.0% |
| City | Population | Air Quality Index | National Avg. |
| Wilmington, MA | 23,390 | 43 | 14.0% |
| North Augusta, SC | 23,370 | 47 | 6.0% |
| Lisle, IL | 23,363 | 55 | 10.0% |
| Oak Harbor, WA | 23,358 | 24 | 52.0% |
| Maywood, IL | 23,351 | 55 | 10.0% |
| Tumwater, WA | 23,390 | 30 | 40.0% |
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