| 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. 21 - Apr. 30 |
| Koppen-Geiger Climate Zone: | Csb - Warm-Summer Mediterranean Climate |
| Ecoregion: | 78e - Inland Siskiyous |
| Heat Zone Days: | 15 - 30 days Over 86°F |
Annual Climate Data for ZIP Code 97532 - Merlin, OR | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 32 | 34 | 35 | 36 | 41 | 46 | 51 | 51 | 47 | 41 | 36 | 32 | 40 |
| Avg Max Temp (°F) | 45 | 49 | 52 | 58 | 66 | 74 | 81 | 82 | 76 | 64 | 49 | 44 | 62 |
| Avg Precip (In.) | 5.08 | 4.51 | 3.96 | 2.34 | 1.34 | .71 | .36 | .52 | 1.02 | 2.64 | 5.36 | 5.51 | 33.36 |