| 2023 Hardiness Zone: | Zone 6b: -5°F to 0°F |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 6b: -5°F to 0°F |
| 1990 Hardiness Zone: | Zone 6a: -10F to -5F |
| Average First Frost Date: | Sep.11 - Sep. 20 |
| Average Last Frost Date: | Jun. 1 - Jun. 10 |
| Koppen-Geiger Climate Zone: | Dsb - Humid Continental Climate - Dry Cool Summer |
| Ecoregion: | 15v - Northern Idaho Hills and Low Relief Mountains |
| Heat Zone Days: | 15 - 30 days Over 86°F |
Annual Climate Data for ZIP Code 83851 - Plummer, ID | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 22 | 26 | 29 | 33 | 38 | 44 | 48 | 48 | 40 | 32 | 27 | 23 | 34 |
| Avg Max Temp (°F) | 36 | 42 | 49 | 56 | 65 | 71 | 80 | 82 | 73 | 59 | 42 | 36 | 57 |
| Avg Precip (In.) | 2.07 | 1.64 | 1.6 | 1.35 | 1.43 | 1.2 | .59 | .68 | .73 | 1.14 | 2.08 | 2.03 | 16.56 |