| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 6b: -5°F to 0°F Zone 5b: -15°F to -10°F | |
| 2012 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 4b: -25°F to -20°F Zone 6a: -10°F to -5°F Zone 5b: -15°F to -10°F | |
| 1990 Hardiness Zone: | Zone 1b: -15F to -10F | |
| Average First Frost Date: | Sep.1 - Sep. 10 | |
| Average Last Frost Date: | May 21 - May 31 | |
| Koppen-Geiger Climate Zone: | Dsb - Humid Continental Climate - Dry Cool Summer | |
| Ecoregion: | 15u - Inland Maritime Foothills and Valleys | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | 15 - 30 days Over 86°F |
Annual Climate Data for ZIP Code 99180 - Usk, WA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 19 | 23 | 26 | 32 | 39 | 45 | 48 | 47 | 39 | 32 | 28 | 21 | 33 |
| Avg Max Temp (°F) | 32 | 40 | 48 | 59 | 69 | 76 | 83 | 84 | 73 | 58 | 40 | 33 | 58 |
| Avg Precip (In.) | 2.67 | 2.38 | 2.14 | 1.73 | 2.12 | 1.78 | 1.19 | 1 | 1.08 | 1.5 | 3.25 | 3.46 | 24.3 |