| 2023 Hardiness Zone: | Zone 8b: 15°F to 20°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 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: | 3c - Prairie Terraces |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 97116 - Forest Grove, OR | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 33 | 35 | 37 | 40 | 45 | 49 | 54 | 53 | 49 | 42 | 38 | 34 | 42 |
| Avg Max Temp (°F) | 46 | 50 | 56 | 61 | 68 | 74 | 81 | 82 | 77 | 65 | 52 | 46 | 63 |
| Avg Precip (In.) | 6.89 | 5.79 | 4.71 | 2.89 | 1.99 | 1.42 | .52 | .76 | 1.59 | 3.13 | 6.99 | 7.74 | 44.42 |