| 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 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: | 10a - Channeled Scablands |
| Heat Zone Days: | 1 - 7 days Over 86°F |
Annual Climate Data for ZIP Code 99224 - Spokane, WA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 22 | 26 | 30 | 35 | 42 | 49 | 54 | 54 | 45 | 36 | 29 | 22 | 37 |
| Avg Max Temp (°F) | 33 | 40 | 48 | 58 | 66 | 74 | 83 | 83 | 73 | 59 | 41 | 33 | 58 |
| Avg Precip (In.) | 1.81 | 1.57 | 1.61 | 1.3 | 1.66 | 1.24 | .79 | .68 | .79 | 1.1 | 2.34 | 2.26 | 17.14 |