| 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 8a: 10°F to 15°F |
| 1990 Hardiness Zone: | Zone 8a: 10F to 15F |
| Average First Frost Date: | Oct. 21 - Oct. 31 |
| Average Last Frost Date: | May 1 - May 10 |
| Koppen-Geiger Climate Zone: | Csb - Warm-Summer Mediterranean Climate |
| Ecoregion: | 3c - Prairie Terraces |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 97370 - Philomath, OR | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 32 | 34 | 36 | 38 | 43 | 47 | 51 | 51 | 47 | 41 | 37 | 33 | 41 |
| Avg Max Temp (°F) | 45 | 49 | 55 | 59 | 66 | 72 | 79 | 80 | 75 | 63 | 51 | 45 | 62 |
| Avg Precip (In.) | 8.52 | 6.63 | 5.54 | 3.15 | 2.11 | 1.36 | .31 | .63 | 1.32 | 3.54 | 7.49 | 8.82 | 49.41 |