Pendleton, Oregon has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 4.7 °C (low) to 18.2 °C (high). Annual precipitation averages 362.2 Millimeters. 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 | -2.1 °C | 5.8 °C | 38.61 mm |
| February | -1.4 °C | 8.7 °C | 32.51 mm |
| March | 1 °C | 13.5 °C | 36.58 mm |
| April | 3.6 °C | 17.3 °C | 36.32 mm |
| May | 7.3 °C | 22.3 °C | 44.96 mm |
| June | 10.6 °C | 26.2 °C | 32 mm |
| July | 13.6 °C | 32.1 °C | 9.4 mm |
| August | 12.9 °C | 31.5 °C | 11.68 mm |
| September | 8.7 °C | 26.3 °C | 13.72 mm |
| October | 3.8 °C | 18.4 °C | 27.43 mm |
| November | 0.2 °C | 10.3 °C | 40.39 mm |
| December | -2.2 °C | 5.6 °C | 38.61 mm |
| Annual | 4.7 °C | 18.2 °C | 362.21 mm |
| 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 : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |