| 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 |
| 1990 Hardiness Zone: | Zone 1b: -15F to -10F |
| Average First Frost Date: | Oct. 1 - Oct. 10 |
| Average Last Frost Date: | May 11 - May 20 |
| 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 99006 - Deer Park, WA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 19 | 23 | 26 | 32 | 39 | 45 | 49 | 48 | 40 | 32 | 28 | 21 | 33 |
| Avg Max Temp (°F) | 33 | 40 | 48 | 58 | 68 | 74 | 84 | 84 | 73 | 59 | 42 | 34 | 58 |
| Avg Precip (In.) | 2.62 | 2.39 | 2.11 | 1.7 | 1.95 | 1.78 | .91 | .75 | .96 | 1.72 | 3.17 | 3.16 | 23.21 |