| 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 |
| 1990 Hardiness Zone: | Zone 6a: -10F to -5F |
| Average First Frost Date: | Oct. 11 - Oct. 20 |
| Average Last Frost Date: | May 1 - May 10 |
| Koppen-Geiger Climate Zone: | Dsb - Humid Continental Climate - Dry Cool Summer |
| Ecoregion: | 15s - Spokane Valley Outwash Plains |
| Heat Zone Days: | 15 - 30 days Over 86°F |
Annual Climate Data for ZIP Code 83854 - Post Falls, ID | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 21 | 25 | 29 | 34 | 41 | 48 | 52 | 52 | 44 | 36 | 29 | 23 | 36 |
| Avg Max Temp (°F) | 34 | 40 | 48 | 57 | 66 | 73 | 82 | 82 | 72 | 59 | 42 | 35 | 57 |
| Avg Precip (In.) | 2.78 | 2.21 | 2.21 | 1.71 | 2.15 | 1.8 | .98 | 1.02 | 1.04 | 1.58 | 3.11 | 3.14 | 23.73 |