| 2023 Hardiness Zone: | Zone 8b: 15°F to 20°F |
| 2012 Hardiness Zone: | Zone 8b: 15°F to 20°F |
| 1990 Hardiness Zone: | Zone 8a: 10F to 15F |
| Average First Frost Date: | Oct. 21 - Oct. 31 |
| Average Last Frost Date: | Apr. 21 - Apr. 30 |
| Koppen-Geiger Climate Zone: | Csb - Warm-Summer Mediterranean Climate |
| Ecoregion: | 3c - Prairie Terraces |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 97114 - Dayton, OR | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 33 | 35 | 37 | 39 | 44 | 48 | 51 | 51 | 48 | 42 | 38 | 34 | 42 |
| Avg Max Temp (°F) | 46 | 51 | 56 | 62 | 69 | 75 | 82 | 83 | 77 | 65 | 52 | 46 | 64 |
| Avg Precip (In.) | 6.4 | 5.24 | 4.45 | 2.8 | 2.03 | 1.25 | .45 | .59 | 1.42 | 2.98 | 6.03 | 7.15 | 40.81 |