| 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. 21 - Mar. 31 |
| 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 97140 - Sherwood, OR | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 34 | 36 | 38 | 41 | 45 | 50 | 54 | 54 | 50 | 43 | 39 | 34 | 43 |
| Avg Max Temp (°F) | 46 | 51 | 56 | 61 | 67 | 73 | 80 | 80 | 75 | 64 | 52 | 46 | 63 |
| Avg Precip (In.) | 6.14 | 5.08 | 4.31 | 2.95 | 2.42 | 1.67 | .67 | .9 | 1.74 | 3.17 | 6.26 | 6.7 | 42.01 |