| 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 |
| 1990 Hardiness Zone: | Zone 8a: 10F to 15F |
| Average First Frost Date: | Oct. 21 - Oct. 31 |
| Average Last Frost Date: | May 1 - May 10 |
| Koppen-Geiger Climate Zone: | Csb - Warm-Summer Mediterranean Climate |
| Ecoregion: | 1f - Willapa Hills |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 98538 - Curtis, WA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 33 | 35 | 37 | 40 | 45 | 49 | 53 | 53 | 49 | 43 | 38 | 34 | 43 |
| Avg Max Temp (°F) | 44 | 49 | 54 | 59 | 65 | 70 | 76 | 77 | 72 | 62 | 50 | 44 | 60 |
| Avg Precip (In.) | 7.95 | 6.5 | 5.79 | 4.14 | 2.58 | 2.07 | .93 | 1.06 | 2.13 | 4.44 | 8.23 | 8.29 | 54.11 |