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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 36°F | 46°F | 40°F | 4.7" |
| February | 38°F | 51°F | 44°F | 3.2" |
| March | 40°F | 57°F | 47°F | 5.2" |
| April | 42°F | 63°F | 51°F | 3.6" |
| May | 48°F | 71°F | 58°F | 2.8" |
| June | 53°F | 76°F | 63°F | 2.1" |
| July | 56°F | 84°F | 69°F | 0.5" |
| August | 56°F | 85°F | 69°F | 0.4" |
| September | 52°F | 78°F | 64°F | 1.6" |
| October | 46°F | 65°F | 55°F | 4.5" |
| November | 42°F | 53°F | 47°F | 6.5" |
| December | 35°F | 45°F | 40°F | 5.1" |
| Index | Fern Prairie | 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. |
| Barberton, WA | 7,317 | 38 | 24.0% |
| Mount Vista, WA | 9,762 | 38 | 24.0% |
| Gresham, OR | 110,456 | 38 | 24.0% |
| Battle Ground, WA | 20,931 | 38 | 24.0% |
| Lewisville, WA | 2,166 | 38 | 24.0% |
| Fern Prairie, WA | 1,989 | 38 | 24.0% |
| City | Population | Air Quality Index | National Avg. |
| Dolan Springs, AZ | 1,989 | 54 | 8.0% |
| Veedersburg, IN | 1,989 | 42 | 16.0% |
| Princeton Junction, NJ | 1,989 | 41 | 18.0% |
| Mount Ayr, IA | 1,988 | 39 | 22.0% |
| Parma, ID | 1,990 | 36 | 28.0% |
| Fern Prairie, WA | 1,989 | 38 | 24.0% |