| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 6b: -5°F to 0°F | |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 6b: -5°F to 0°F Zone 5b: -15°F to -10°F | |
| 1990 Hardiness Zone: | Zone 1b: -15F to -10F | |
| Average First Frost Date: | Sep. 21 - Sep. 30 | |
| Average Last Frost Date: | Jun. 11 - Jun. 20 | |
| Koppen-Geiger Climate Zone: | Cfa - Humid Subtropical Climate | |
| Ecoregion: | 15f - Grassy Potlatch Ridges | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 83555 - Winchester, ID | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 20 | 22 | 26 | 31 | 37 | 42 | 46 | 46 | 39 | 33 | 26 | 20 | 32 |
| Avg Max Temp (°F) | 35 | 40 | 45 | 52 | 60 | 67 | 77 | 78 | 69 | 57 | 42 | 35 | 55 |
| Avg Precip (In.) | 1.9 | 1.63 | 2.38 | 2.71 | 3.18 | 2.22 | 1.42 | 1.23 | 1.44 | 1.85 | 2.45 | 1.94 | 24.36 |