| 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: | 3d - Valley Foothills |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 97236 - Portland, OR | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 34 | 36 | 38 | 41 | 46 | 51 | 55 | 55 | 51 | 45 | 39 | 35 | 44 |
| Avg Max Temp (°F) | 46 | 51 | 56 | 61 | 68 | 73 | 80 | 81 | 76 | 64 | 52 | 46 | 63 |
| Avg Precip (In.) | 7.46 | 5.97 | 5.37 | 4.03 | 3.29 | 2.28 | .9 | 1.19 | 2.24 | 4.14 | 7.62 | 7.95 | 52.44 |