| 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: | Apr. 1 - Apr. 10 | |
| Koppen-Geiger Climate Zone: | Csb - Warm-Summer Mediterranean Climate | |
| Ecoregion: | 3a - Portland/Vancouver Basin | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 97060 - Troutdale, 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 | 54 | 50 | 44 | 39 | 34 | 44 |
| Avg Max Temp (°F) | 46 | 51 | 57 | 62 | 68 | 74 | 81 | 82 | 76 | 65 | 53 | 46 | 63 |
| Avg Precip (In.) | 6.35 | 5.32 | 4.57 | 3.72 | 2.91 | 2.22 | .93 | 1.16 | 2.07 | 3.49 | 6.69 | 6.88 | 46.3 |