| 2023 Hardiness Zone: | Zone 8a: 10°F to 15°F Zone 7b: 5°F to 10°F Zone 7a: 0°F to 5°F |
| 2012 Hardiness Zone: | Zone 6b: -5°F to 0°F Zone 8a: 10°F to 15°F Zone 7b: 5°F to 10°F Zone 7a: 0°F to 5°F |
| 1990 Hardiness Zone: | Zone 6b: -5F to 0F |
| Average First Frost Date: | Oct. 11 - Oct. 20 |
| Average Last Frost Date: | May 1 - May 10 |
| Koppen-Geiger Climate Zone: | Dsb - Humid Continental Climate - Dry Cool Summer |
| Ecoregion: | 10c - Umatilla Plateau |
| Heat Zone Days: | 1 - 7 days Over 86°F |
Annual Climate Data for ZIP Code 97065 - Wasco, OR | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 26 | 29 | 33 | 37 | 43 | 49 | 54 | 53 | 46 | 38 | 32 | 27 | 39 |
| Avg Max Temp (°F) | 39 | 45 | 54 | 61 | 69 | 76 | 84 | 84 | 76 | 64 | 48 | 40 | 62 |
| Avg Precip (In.) | 1.76 | 1.22 | 1.13 | .81 | .68 | .55 | .27 | .38 | .49 | .86 | 1.71 | 1.69 | 11.55 |