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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 32°F | 47°F | 38°F | 6.1" |
| February | 34°F | 52°F | 42°F | 4.6" |
| March | 37°F | 57°F | 46°F | 5.7" |
| April | 39°F | 62°F | 50°F | 3.1" |
| May | 45°F | 70°F | 57°F | 2.5" |
| June | 50°F | 75°F | 62°F | 1.4" |
| July | 54°F | 83°F | 68°F | 0.3" |
| August | 54°F | 84°F | 68°F | 0.5" |
| September | 49°F | 78°F | 62°F | 1.6" |
| October | 43°F | 65°F | 53°F | 4.1" |
| November | 37°F | 53°F | 45°F | 7.1" |
| December | 32°F | 45°F | 38°F | 6.9" |
| Index | Ridgefield | Washington | National |
| Air quality index | 38 | 36 | 42 |
| Pollution index | 1,899,410 | 4,541,850 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 285 |
| Days with moderate air quality | 77 |
| Days w/ poor A.Q. for sensitive groups | 3 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.003% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.010% |
| Mercury | 0.002% |
| City | Population | Air Quality Index | National Avg. |
| Deer Island, OR | 105 | 18 | 64.0% |
| Kalama, WA | 2,708 | 18 | 64.0% |
| St. Helens, OR | 13,779 | 18 | 64.0% |
| Woodland, WA | 6,223 | 18 | 64.0% |
| Columbia City, OR | 1,770 | 18 | 64.0% |
| Ridgefield, WA | 8,751 | 38 | 24.0% |
| City | Population | Air Quality Index | National Avg. |
| Maysville, KY | 8,752 | 14 | 72.0% |
| Glens Falls North, NY | 8,753 | 36 | 28.0% |
| Riverside, IL | 8,748 | 55 | 10.0% |
| Fitzgerald, GA | 8,747 | 26 | 48.0% |
| Marathon, FL | 8,746 | 41 | 18.0% |
| Ridgefield, WA | 8,751 | 38 | 24.0% |
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