| 2023 Hardiness Zone: | 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 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 11 - May 20 |
| Koppen-Geiger Climate Zone: | BSk - Cold Semi-Arid Climate |
| Ecoregion: | 10c - Umatilla Plateau |
| Heat Zone Days: | 1 - 7 days Over 86°F |
Annual Climate Data for ZIP Code 97039 - Moro, OR | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 25 | 28 | 32 | 36 | 41 | 47 | 53 | 52 | 45 | 37 | 31 | 26 | 38 |
| Avg Max Temp (°F) | 38 | 44 | 52 | 59 | 66 | 74 | 82 | 83 | 74 | 62 | 47 | 39 | 60 |
| Avg Precip (In.) | 1.61 | 1.18 | 1.12 | .89 | .94 | .62 | .31 | .4 | .52 | .88 | 1.68 | 1.61 | 11.75 |