| 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: | Oct. 1 - Oct. 10 |
| Average Last Frost Date: | May 11 - May 20 |
| Koppen-Geiger Climate Zone: | Dsb - Humid Continental Climate - Dry Cool Summer |
| Ecoregion: | 10a - Channeled Scablands |
| Heat Zone Days: | 15 - 30 days Over 86°F |
Annual Climate Data for ZIP Code 98843 - Orondo, WA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 20 | 24 | 30 | 36 | 44 | 51 | 56 | 56 | 48 | 37 | 29 | 21 | 38 |
| Avg Max Temp (°F) | 34 | 40 | 51 | 61 | 69 | 76 | 84 | 84 | 75 | 61 | 43 | 33 | 59 |
| Avg Precip (In.) | 2.54 | 1.67 | 1.07 | .8 | .8 | .82 | .38 | .49 | .59 | .98 | 2.1 | 2.78 | 15.02 |