| 2023 Hardiness Zone: | Zone 8b: 15°F to 20°F Zone 9a: 20°F to 25°F Zone 8a: 10°F to 15°F |
| 2012 Hardiness Zone: | Zone 8b: 15°F to 20°F Zone 9a: 20°F to 25°F Zone 8a: 10°F to 15°F |
| 1990 Hardiness Zone: | Zone 8b: 15F to 20F |
| 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: | 1a - Coastal Lowlands |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 98624 - Ilwaco, WA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 36 | 37 | 38 | 41 | 45 | 49 | 52 | 52 | 48 | 42 | 39 | 36 | 43 |
| Avg Max Temp (°F) | 48 | 51 | 53 | 56 | 60 | 63 | 66 | 67 | 67 | 61 | 53 | 48 | 58 |
| Avg Precip (In.) | 11.65 | 9.89 | 9.01 | 5.92 | 3.86 | 3.05 | 1.64 | 1.68 | 3.33 | 6.83 | 11.83 | 12.49 | 81.18 |