| 2023 Hardiness Zone: | Zone 7b: 5°F to 10°F Zone 7a: 0°F to 5°F | |
| 2012 Hardiness Zone: | Zone 6b: -5°F to 0°F Zone 7a: 0°F to 5°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: | 9a - Yakima Plateau and Slopes | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 98619 - Glenwood, WA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 24 | 26 | 30 | 33 | 39 | 44 | 49 | 48 | 42 | 34 | 30 | 25 | 35 |
| Avg Max Temp (°F) | 37 | 42 | 50 | 58 | 67 | 74 | 82 | 83 | 75 | 61 | 45 | 37 | 59 |
| Avg Precip (In.) | 6.17 | 4.99 | 3.55 | 2.01 | 1.28 | .92 | .35 | .57 | 1.15 | 2.56 | 5.6 | 6.45 | 35.61 |