| 2023 Hardiness Zone: | Zone 8b: 15°F to 20°F | |
| 2012 Hardiness Zone: | Zone 8b: 15°F to 20°F Zone 8a: 10°F to 15°F | |
| 1990 Hardiness Zone: | Zone 8a: 10F to 15F | |
| Average First Frost Date: | Oct. 21 - Oct. 31 | |
| Average Last Frost Date: | May 1 - May 10 | |
| Koppen-Geiger Climate Zone: | Csb - Warm-Summer Mediterranean Climate | |
| Ecoregion: | 3c - Prairie Terraces | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 97338 - Dallas, OR | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 33 | 34 | 36 | 39 | 43 | 48 | 50 | 50 | 47 | 41 | 37 | 33 | 41 |
| Avg Max Temp (°F) | 46 | 50 | 55 | 60 | 67 | 73 | 81 | 81 | 76 | 65 | 51 | 45 | 62 |
| Avg Precip (In.) | 8.42 | 7.09 | 5.69 | 3.4 | 2.26 | 1.42 | .51 | .68 | 1.52 | 3.61 | 8.09 | 9.34 | 52.02 |