| 2023 Hardiness Zone: | Zone 8b: 15°F to 20°F Zone 9a: 20°F to 25°F | |
| 2012 Hardiness Zone: | Zone 8b: 15°F to 20°F Zone 8a: 10°F to 15°F | |
| 1990 Hardiness Zone: | Zone 8b: 15F to 20F | |
| Average First Frost Date: | Nov. 21 - Nov. 30 | |
| Average Last Frost Date: | Apr. 1 - Apr. 10 | |
| Koppen-Geiger Climate Zone: | Csb - Warm-Summer Mediterranean Climate | |
| Ecoregion: | 3c - Prairie Terraces | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 97347 - Grand Ronde, OR | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 33 | 34 | 36 | 38 | 42 | 46 | 50 | 50 | 47 | 41 | 37 | 33 | 41 |
| Avg Max Temp (°F) | 46 | 49 | 53 | 58 | 64 | 70 | 77 | 78 | 73 | 63 | 51 | 45 | 61 |
| Avg Precip (In.) | 9.1 | 8.04 | 7.07 | 4.58 | 2.66 | 1.79 | .67 | .61 | 1.89 | 4.18 | 9.5 | 10.47 | 60.55 |