| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F 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 5b: -15°F to -10°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: | 15s - Spokane Valley Outwash Plains |
| Heat Zone Days: | 8 - 14 days Over 86°F |
Annual Climate Data for ZIP Code 83869 - Spirit Lake, ID | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 21 | 23 | 27 | 32 | 39 | 45 | 50 | 49 | 42 | 33 | 28 | 22 | 34 |
| Avg Max Temp (°F) | 33 | 38 | 46 | 55 | 64 | 70 | 78 | 78 | 69 | 55 | 40 | 34 | 55 |
| Avg Precip (In.) | 3.08 | 2.57 | 2.29 | 2.02 | 2.44 | 2.09 | 1.25 | 1.21 | 1.33 | 1.99 | 3.55 | 3.69 | 27.52 |