Pendleton, Oregon has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 40.4 °F (low) to 64.7 °F (high). Annual precipitation averages 14.3 Inches. Pendleton is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 28.2 °F | 42.5 °F | 1.52 in. |
| February | 29.5 °F | 47.7 °F | 1.28 in. |
| March | 33.8 °F | 56.3 °F | 1.44 in. |
| April | 38.4 °F | 63.2 °F | 1.43 in. |
| May | 45.1 °F | 72.1 °F | 1.77 in. |
| June | 51.1 °F | 79.2 °F | 1.26 in. |
| July | 56.4 °F | 89.8 °F | 0.37 in. |
| August | 55.3 °F | 88.7 °F | 0.46 in. |
| September | 47.6 °F | 79.4 °F | 0.54 in. |
| October | 38.9 °F | 65.2 °F | 1.08 in. |
| November | 32.3 °F | 50.6 °F | 1.59 in. |
| December | 28.0 °F | 42.0 °F | 1.52 in. |
| Annual | 40.4 °F | 64.7 °F | 14.26 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7a : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |