| 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 |
| 1990 Hardiness Zone: | Zone 8b: 15F to 20F |
| Average First Frost Date: | Nov. 11 - Nov. 20 |
| Average Last Frost Date: | Mar. 11 - Mar. 20 |
| Koppen-Geiger Climate Zone: | Csb - Warm-Summer Mediterranean Climate |
| Ecoregion: | 3b - Willamette River and Tributaries Gallery Forest |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 97070 - Wilsonville, OR | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 34 | 35 | 37 | 40 | 45 | 50 | 53 | 53 | 49 | 42 | 38 | 34 | 42 |
| Avg Max Temp (°F) | 47 | 51 | 56 | 61 | 67 | 73 | 80 | 81 | 76 | 64 | 52 | 46 | 63 |
| Avg Precip (In.) | 5.96 | 5.01 | 4.24 | 3.03 | 2.47 | 1.7 | .67 | .86 | 1.74 | 3.32 | 6.37 | 6.67 | 42.04 |