| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 6b: -5°F to 0°F Zone 7b: 5°F to 10°F Zone 7a: 0°F to 5°F Zone 8b: 15°F to 20°F Zone 8a: 10°F to 15°F Zone 9a: 20°F to 25°F | |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 6b: -5°F to 0°F Zone 7b: 5°F to 10°F Zone 7a: 0°F to 5°F Zone 8b: 15°F to 20°F Zone 8a: 10°F to 15°F Zone 5b: -15°F to -10°F | |
| 1990 Hardiness Zone: | Zone 8b: 15F to 20F | |
| Average First Frost Date: | Sep. 21 - Sep. 30 | |
| Average Last Frost Date: | Jun. 1 - Jun. 10 | |
| Koppen-Geiger Climate Zone: | Csb - Warm-Summer Mediterranean Climate | |
| Ecoregion: | 4a - Western Cascades Lowlands and Valleys | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 98648 - Stevenson, WA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 32 | 34 | 36 | 40 | 45 | 50 | 54 | 54 | 49 | 43 | 38 | 32 | 42 |
| Avg Max Temp (°F) | 43 | 47 | 53 | 59 | 65 | 72 | 79 | 80 | 74 | 63 | 50 | 43 | 61 |
| Avg Precip (In.) | 15.85 | 11.78 | 8.73 | 4.82 | 4.12 | 2.27 | .95 | 1.22 | 3.36 | 8.05 | 13.17 | 19.76 | 94.08 |