| 2023 Hardiness Zone: | Zone 8b: 15°F to 20°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. 11 - Nov. 20 | |
| 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 97396 - Willamina, OR | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 33 | 35 | 36 | 39 | 43 | 47 | 50 | 50 | 47 | 41 | 37 | 33 | 41 |
| Avg Max Temp (°F) | 46 | 50 | 55 | 60 | 67 | 73 | 80 | 81 | 76 | 64 | 51 | 45 | 62 |
| Avg Precip (In.) | 8.02 | 7.08 | 6.09 | 3.87 | 2.37 | 1.48 | .54 | .54 | 1.67 | 3.49 | 8.16 | 9.44 | 52.74 |