| 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 7a: 0°F to 5°F | |
| 1990 Hardiness Zone: | Zone 6a: -10F to -5F | |
| Average First Frost Date: | Sep. 21 - Sep. 30 | |
| Average Last Frost Date: | May 21 - May 31 | |
| Koppen-Geiger Climate Zone: | Dsb - Humid Continental Climate - Dry Cool Summer | |
| Ecoregion: | 15f - Grassy Potlatch Ridges | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 83871 - Troy, ID | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 23 | 25 | 29 | 34 | 39 | 44 | 48 | 48 | 40 | 34 | 28 | 23 | 35 |
| Avg Max Temp (°F) | 35 | 41 | 49 | 56 | 65 | 72 | 81 | 83 | 73 | 59 | 41 | 35 | 57 |
| Avg Precip (In.) | 3.41 | 2.9 | 2.7 | 2.44 | 2.63 | 1.93 | 1.19 | 1.15 | 1.31 | 2.02 | 3.8 | 3.6 | 29.07 |