| 2023 Hardiness Zone: | Zone 8b: 15°F to 20°F Zone 8a: 10°F to 15°F Zone 7b: 5°F to 10°F |
| 2012 Hardiness Zone: | Zone 8a: 10°F to 15°F Zone 7b: 5°F to 10°F Zone 7a: 0°F to 5°F |
| 1990 Hardiness Zone: | Zone 7b: 5F to 10F |
| Average First Frost Date: | Oct. 1 - Oct. 10 |
| Average Last Frost Date: | May 11 - May 20 |
| Koppen-Geiger Climate Zone: | Csb - Warm-Summer Mediterranean Climate |
| Ecoregion: | 9c - Oak/Conifer Foothills |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 98651 - Underwood, WA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 28 | 30 | 33 | 37 | 43 | 49 | 53 | 52 | 45 | 37 | 33 | 28 | 39 |
| Avg Max Temp (°F) | 40 | 45 | 53 | 60 | 68 | 74 | 82 | 82 | 75 | 63 | 47 | 40 | 61 |
| Avg Precip (In.) | 7.11 | 5.81 | 4.26 | 2.69 | 1.64 | 1.14 | .42 | .76 | 1.6 | 3.52 | 6.89 | 8.38 | 44.23 |