| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 6b: -5°F to 0°F |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 5b: -15°F to -10°F |
| 1990 Hardiness Zone: | Zone 1b: -15F to -10F |
| Average First Frost Date: | Oct. 1 - Oct. 10 |
| 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 99009 - Elk, WA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 19 | 24 | 27 | 33 | 40 | 46 | 50 | 48 | 41 | 33 | 28 | 22 | 34 |
| Avg Max Temp (°F) | 34 | 41 | 49 | 58 | 68 | 75 | 84 | 84 | 74 | 59 | 42 | 34 | 58 |
| Avg Precip (In.) | 2.38 | 2.06 | 1.93 | 1.48 | 1.88 | 1.56 | .9 | .77 | .84 | 1.49 | 2.94 | 2.77 | 21 |