| 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 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: | 1a - Coastal Lowlands |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 98537 - Cosmopolis, WA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 36 | 37 | 38 | 41 | 45 | 50 | 53 | 53 | 50 | 44 | 39 | 36 | 43 |
| Avg Max Temp (°F) | 46 | 50 | 53 | 57 | 62 | 65 | 69 | 70 | 69 | 61 | 51 | 46 | 58 |
| Avg Precip (In.) | 11.63 | 10.11 | 8.7 | 5.92 | 3.72 | 2.57 | 1.44 | 1.68 | 3.06 | 6.77 | 12.08 | 12.47 | 80.13 |