| 2023 Hardiness Zone: | Zone 8b: 15°F to 20°F Zone 8a: 10°F to 15°F Zone 7b: 5°F to 10°F | |
| 2012 Hardiness Zone: | Zone 8b: 15°F to 20°F Zone 8a: 10°F to 15°F Zone 7b: 5°F to 10°F | |
| 1990 Hardiness Zone: | Zone 8a: 10F to 15F | |
| Average First Frost Date: | Oct. 21 - Oct. 31 | |
| Average Last Frost Date: | Apr. 21 - Apr. 30 | |
| Koppen-Geiger Climate Zone: | Csb - Warm-Summer Mediterranean Climate | |
| Ecoregion: | 3d - Valley Foothills | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 97381 - Silverton, OR | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 34 | 36 | 39 | 41 | 46 | 51 | 54 | 55 | 51 | 44 | 39 | 34 | 44 |
| Avg Max Temp (°F) | 46 | 51 | 56 | 60 | 67 | 73 | 80 | 80 | 75 | 64 | 52 | 46 | 63 |
| Avg Precip (In.) | 6.05 | 5.15 | 4.59 | 3.58 | 2.74 | 2.04 | .82 | .94 | 1.81 | 3.56 | 6.91 | 6.9 | 45.1 |