| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 12°F | 37°F | 24°F | 1.3" |
| February | 18°F | 43°F | 30°F | 0.9" |
| March | 25°F | 52°F | 38°F | 1.1" |
| April | 27°F | 60°F | 43°F | 0.9" |
| May | 35°F | 69°F | 52°F | 1.4" |
| June | 41°F | 79°F | 60°F | 0.8" |
| July | 48°F | 91°F | 71°F | 0.2" |
| August | 44°F | 89°F | 68°F | 0.2" |
| September | 36°F | 80°F | 58°F | 0.4" |
| October | 27°F | 65°F | 45°F | 0.9" |
| November | 21°F | 49°F | 34°F | 1.2" |
| December | 11°F | 36°F | 24°F | 2.0" |
| Index | Juntura | Oregon | National |
| Air quality index | 36 | 32 | 42 |
| Pollution index | 1,647,310 | 7,156,356 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 293 |
| Days with moderate air quality | 60 |
| Days w/ poor A.Q. for sensitive groups | 9 |
| Days with unhealthy air quality | 3 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.001% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Juntura, OR | 29 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Portland, IA | 29 | 15 | 70.0% |
| Annapolis, IL | 29 | 45 | 10.0% |
| Cobden, MN | 29 | 32 | 36.0% |
| Louisburg, MN | 29 | 25 | 50.0% |
| Biehle, MO | 29 | 43 | 14.0% |
| Juntura, OR | 29 | 36 | 28.0% |