Wallowa, Oregon has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 33.5 °F (low) to 60.8 °F (high). Annual precipitation averages 17.7 Inches. Wallowa is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Jun. 1 - Jun. 10 through the first frost around Aug. 11 - Aug. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 21.8 °F | 36.8 °F | 1.68 in. |
| February | 23.4 °F | 43.1 °F | 1.52 in. |
| March | 28.1 °F | 51.2 °F | 1.53 in. |
| April | 32.3 °F | 58.7 °F | 1.61 in. |
| May | 38.8 °F | 68.0 °F | 2.06 in. |
| June | 43.7 °F | 75.1 °F | 1.56 in. |
| July | 47.7 °F | 86.2 °F | 0.55 in. |
| August | 46.5 °F | 87.0 °F | 0.84 in. |
| September | 39.7 °F | 77.9 °F | 0.74 in. |
| October | 32.3 °F | 62.9 °F | 1.46 in. |
| November | 26.6 °F | 46.4 °F | 2.04 in. |
| December | 21.3 °F | 36.7 °F | 2.06 in. |
| Annual | 33.5 °F | 60.8 °F | 17.65 in. |
| Average First Frost Date | Aug. 11 - Aug. 20 |
| Average Last Frost Date | Jun. 1 - Jun. 10 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |