| 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: | 3a - Portland/Vancouver Basin |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 97213 - Portland, OR | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 34 | 36 | 38 | 41 | 47 | 51 | 55 | 55 | 51 | 44 | 39 | 35 | 44 |
| Avg Max Temp (°F) | 46 | 51 | 56 | 61 | 67 | 73 | 79 | 80 | 75 | 64 | 52 | 46 | 62 |
| Avg Precip (In.) | 5.87 | 4.83 | 4.24 | 3.04 | 2.62 | 1.79 | .78 | 1.05 | 1.86 | 3.27 | 6.25 | 6.44 | 42.05 |