| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 6b: -5°F to 0°F Zone 5a: -20°F to -15°F Zone 7a: 0°F to 5°F Zone 5b: -15°F to -10°F |
| 2012 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 6b: -5°F to 0°F Zone 4b: -25°F to -20°F Zone 6a: -10°F to -5°F Zone 5b: -15°F to -10°F |
| 1990 Hardiness Zone: | Zone 4a: -30F to -25F |
| Average First Frost Date: | Aug. 21 - Aug. 31 |
| Average Last Frost Date: | Jun. 21 - Jun. 30 |
| Koppen-Geiger Climate Zone: | BSk - Cold Semi-Arid Climate |
| Ecoregion: | 11o - Cold Basins |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 97873 - Seneca, OR | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 12 | 16 | 22 | 27 | 32 | 37 | 40 | 38 | 31 | 24 | 20 | 13 | 26 |
| Avg Max Temp (°F) | 34 | 39 | 45 | 52 | 61 | 69 | 80 | 80 | 71 | 59 | 42 | 34 | 56 |
| Avg Precip (In.) | 1.42 | 1.3 | 1.42 | 1.15 | 1.65 | 1.19 | .69 | .75 | .72 | .87 | 1.58 | 1.76 | 14.51 |