| 2023 Hardiness Zone: | Zone 8a: 10°F to 15°F Zone 7b: 5°F to 10°F Zone 7a: 0°F to 5°F |
| 2012 Hardiness Zone: | Zone 8a: 10°F to 15°F Zone 7b: 5°F to 10°F Zone 7a: 0°F to 5°F |
| 1990 Hardiness Zone: | Zone 6b: -5F to 0F |
| Average First Frost Date: | Oct. 11 - Oct. 20 |
| Average Last Frost Date: | Apr. 21 - Apr. 30 |
| Koppen-Geiger Climate Zone: | Csb - Warm-Summer Mediterranean Climate |
| Ecoregion: | 10e - Pleistocene Lake Basins |
| Heat Zone Days: | 31 - 45 days Over 86°F |
Annual Climate Data for ZIP Code 97058 - The Dalles, OR | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 27 | 30 | 34 | 38 | 44 | 50 | 55 | 54 | 47 | 39 | 33 | 28 | 40 |
| Avg Max Temp (°F) | 40 | 47 | 55 | 63 | 71 | 78 | 85 | 85 | 78 | 65 | 49 | 41 | 63 |
| Avg Precip (In.) | 3.28 | 1.8 | 1.42 | .76 | .68 | .3 | .25 | .35 | .51 | 1.11 | 2.25 | 2.89 | 15.6 |