| 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 9a: 20°F to 25°F Zone 8a: 10°F to 15°F |
| 1990 Hardiness Zone: | Zone 8b: 15F to 20F |
| Average First Frost Date: | Nov. 1 - Nov. 10 |
| Average Last Frost Date: | Apr. 11 - Apr. 20 |
| Koppen-Geiger Climate Zone: | Csb - Warm-Summer Mediterranean Climate |
| Ecoregion: | 78c - Umpqua Interior Foothills |
| Heat Zone Days: | 8 - 14 days Over 86°F |
Annual Climate Data for ZIP Code 97469 - Riddle, OR | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 34 | 36 | 37 | 39 | 45 | 49 | 54 | 53 | 49 | 43 | 38 | 35 | 43 |
| Avg Max Temp (°F) | 48 | 53 | 57 | 61 | 68 | 74 | 82 | 83 | 79 | 67 | 53 | 47 | 64 |
| Avg Precip (In.) | 4.95 | 3.98 | 3.68 | 2.53 | 1.64 | .88 | .39 | .63 | 1.05 | 2.26 | 5.44 | 5.48 | 32.91 |