| 2023 Hardiness Zone: | Zone 6b: -5°F to 0°F Zone 7b: 5°F to 10°F Zone 7a: 0°F to 5°F | |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 6b: -5°F to 0°F Zone 7b: 5°F to 10°F Zone 7a: 0°F to 5°F Zone 5b: -15°F to -10°F | |
| 1990 Hardiness Zone: | Zone 6b: -5F to 0F | |
| Average First Frost Date: | Sep. 21 - Sep. 30 | |
| Average Last Frost Date: | Jun. 1 - Jun. 10 | |
| Koppen-Geiger Climate Zone: | Dsb - Humid Continental Climate - Dry Cool Summer | |
| Ecoregion: | 10f - Dissected Loess Uplands | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | 31 - 45 days Over 86°F |
Annual Climate Data for ZIP Code 99347 - Pomeroy, WA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 24 | 27 | 32 | 37 | 43 | 49 | 53 | 53 | 46 | 37 | 31 | 25 | 38 |
| Avg Max Temp (°F) | 40 | 46 | 53 | 61 | 69 | 77 | 86 | 86 | 77 | 63 | 48 | 40 | 62 |
| Avg Precip (In.) | 2.03 | 1.73 | 1.68 | 1.4 | 1.57 | 1.17 | .62 | .81 | .86 | 1.22 | 2.11 | 2.09 | 17.3 |