| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 30°F | 43°F | 36°F | 2.2" |
| February | 32°F | 51°F | 40°F | 1.4" |
| March | 36°F | 59°F | 46°F | 1.5" |
| April | 41°F | 66°F | 52°F | 0.8" |
| May | 48°F | 76°F | 61°F | 1.0" |
| June | 55°F | 82°F | 67°F | 0.5" |
| July | 60°F | 92°F | 75°F | 0.1" |
| August | 59°F | 91°F | 75°F | 0.2" |
| September | 52°F | 83°F | 66°F | 0.4" |
| October | 43°F | 67°F | 54°F | 1.3" |
| November | 35°F | 53°F | 43°F | 2.1" |
| December | 29°F | 42°F | 35°F | 3.1" |
| Index | Rowena | Oregon | National |
| Air quality index | 23 | 32 | 42 |
| Pollution index | 1,957,960 | 7,156,356 | 2,726,193 |
| Measurement | Total |
| Days measured | 350 |
| Days with good air quality | 298 |
| Days with moderate air quality | 52 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.040% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.010% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Bingen, WA | 577 | 23 | 54.0% |
| Dallesport, WA | 1,357 | 23 | 54.0% |
| Odell, OR | 2,553 | 23 | 54.0% |
| Lyle, WA | 267 | 23 | 54.0% |
| Klickitat, WA | 262 | 23 | 54.0% |
| Rowena, OR | 203 | 23 | 54.0% |
| City | Population | Air Quality Index | National Avg. |
| Gakona, AK | 203 | 31 | 38.0% |
| La Vina, CA | 203 | 50 | = 100 |
| Glen Ridge, FL | 203 | 36 | 28.0% |
| Highland Park, FL | 203 | 36 | 28.0% |
| Whitfield CDP (Santa Rosa County), FL | 203 | 38 | 24.0% |
| Rowena, OR | 203 | 23 | 54.0% |
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