| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 6b: -5°F to 0°F Zone 7b: 5°F to 10°F Zone 7a: 0°F to 5°F |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 6b: -5°F to 0°F Zone 7a: 0°F to 5°F Zone 5b: -15°F to -10°F |
| 1990 Hardiness Zone: | Zone 6a: -10F to -5F |
| Average First Frost Date: | Oct. 11 - Oct. 20 |
| Average Last Frost Date: | May 1 - May 10 |
| Koppen-Geiger Climate Zone: | BSk - Cold Semi-Arid Climate |
| Ecoregion: | 10c - Umatilla Plateau |
| Heat Zone Days: | 46 - 60 days Over 86°F |
Annual Climate Data for ZIP Code 97801 - Pendleton, OR | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 27 | 30 | 35 | 39 | 45 | 51 | 56 | 56 | 48 | 40 | 33 | 27 | 41 |
| Avg Max Temp (°F) | 41 | 47 | 55 | 62 | 70 | 79 | 88 | 87 | 77 | 64 | 49 | 41 | 63 |
| Avg Precip (In.) | 1.41 | 1.19 | 1.16 | 1.05 | 1.1 | .74 | .38 | .5 | .55 | .91 | 1.57 | 1.44 | 11.99 |