| 2023 Hardiness Zone: | Zone 8b: 15°F to 20°F Zone 9a: 20°F to 25°F Zone 8a: 10°F to 15°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 Zone 9b: 25°F to 30°F |
| 1990 Hardiness Zone: | Zone 8b: 15F to 20F |
| Average First Frost Date: | Oct. 1 - Oct. 10 |
| Average Last Frost Date: | Jun. 1 - Jun. 10 |
| Koppen-Geiger Climate Zone: | Csb - Warm-Summer Mediterranean Climate |
| Ecoregion: | 78a - Rogue/Illinois Valleys |
| Heat Zone Days: | 46 - 60 days Over 86°F |
Annual Climate Data for ZIP Code 97538 - Selma, OR | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 31 | 33 | 34 | 35 | 39 | 45 | 49 | 49 | 45 | 39 | 35 | 32 | 39 |
| Avg Max Temp (°F) | 47 | 51 | 56 | 62 | 70 | 77 | 85 | 85 | 80 | 68 | 52 | 46 | 65 |
| Avg Precip (In.) | 9.12 | 7.53 | 6.41 | 3.33 | 1.89 | .73 | .34 | .59 | 1.16 | 3.1 | 8.04 | 8.84 | 51.09 |