| 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: | 10b - Loess Islands | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | 8 - 14 days Over 86°F |
Annual Climate Data for ZIP Code 99029 - Reardan, WA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 20 | 24 | 29 | 34 | 40 | 46 | 51 | 51 | 43 | 34 | 28 | 21 | 35 |
| Avg Max Temp (°F) | 32 | 39 | 48 | 57 | 66 | 73 | 82 | 82 | 73 | 59 | 40 | 33 | 57 |
| Avg Precip (In.) | 1.5 | 1.54 | 1.6 | 1.14 | 1.57 | 1.34 | .86 | .6 | .79 | 1.15 | 2.18 | 1.99 | 16.25 |