| 2023 Hardiness Zone: | Zone 6b: -5°F to 0°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: | 15v - Northern Idaho Hills and Low Relief Mountains | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | 15 - 30 days Over 86°F |
Annual Climate Data for ZIP Code 83833 - Harrison, ID | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 23 | 26 | 30 | 35 | 41 | 47 | 51 | 51 | 43 | 35 | 30 | 24 | 36 |
| Avg Max Temp (°F) | 35 | 41 | 49 | 58 | 66 | 73 | 82 | 83 | 73 | 59 | 43 | 35 | 58 |
| Avg Precip (In.) | 2.31 | 1.88 | 1.89 | 1.59 | 1.83 | 1.44 | .88 | .82 | .92 | 1.36 | 2.54 | 2.45 | 19.91 |