| 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 | Shaniko | Oregon | National |
| Air quality index | 23 | 32 | 42 |
| Pollution index | 1,258,680 | 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 | 0.000% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.010% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Antelope, OR | 143 | 23 | 54.0% |
| Shaniko, OR | 12 | 23 | 54.0% |
| City | Population | Air Quality Index | National Avg. |
| Chicken, AK | 12 | 38 | 24.0% |
| Hyder, AK | 12 | 20 | 60.0% |
| Bucks, AL | 12 | 42 | 16.0% |
| Victoria, AR | 12 | 26 | 48.0% |
| Durango, IA | 12 | 29 | 42.0% |
| Shaniko, OR | 12 | 23 | 54.0% |
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