| 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 |
| 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: | 15 - 30 days Over 86°F |
Annual Climate Data for ZIP Code 97470 - Roseburg, OR | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 34 | 36 | 37 | 40 | 44 | 49 | 53 | 53 | 49 | 43 | 39 | 34 | 43 |
| Avg Max Temp (°F) | 48 | 53 | 58 | 63 | 69 | 76 | 84 | 84 | 79 | 67 | 54 | 47 | 65 |
| Avg Precip (In.) | 5.14 | 4.03 | 3.71 | 2.83 | 1.8 | 1.08 | .38 | .65 | 1.13 | 2.52 | 5.33 | 5.67 | 34.27 |