| 2023 Hardiness Zone: | Zone 8b: 15°F to 20°F Zone 8a: 10°F to 15°F | |
| 2012 Hardiness Zone: | Zone 8b: 15°F to 20°F Zone 8a: 10°F to 15°F Zone 7b: 5°F to 10°F | |
| 1990 Hardiness Zone: | Zone 8a: 10F to 15F | |
| Average First Frost Date: | Nov. 1 - Nov. 10 | |
| Average Last Frost Date: | Apr. 11 - Apr. 20 | |
| 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 98601 - Amboy, WA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 32 | 34 | 36 | 39 | 44 | 48 | 51 | 51 | 48 | 42 | 37 | 33 | 41 |
| Avg Max Temp (°F) | 44 | 49 | 54 | 59 | 66 | 71 | 78 | 79 | 74 | 63 | 51 | 44 | 61 |
| Avg Precip (In.) | 8.58 | 7.03 | 6.28 | 4.55 | 3.44 | 2.62 | 1.03 | 1.49 | 2.71 | 4.98 | 9.09 | 9.79 | 61.6 |