| 2023 Hardiness Zone: | Zone 6b: -5°F to 0°F 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. 11 - Oct. 20 |
| Average Last Frost Date: | Apr. 21 - Apr. 30 |
| Koppen-Geiger Climate Zone: | Csa - Hot-Summer Mediterranean Climate |
| Ecoregion: | 10e - Pleistocene Lake Basins |
| Heat Zone Days: | 31 - 45 days Over 86°F |
Annual Climate Data for ZIP Code 97862 - Milton Freewater, OR | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 27 | 31 | 36 | 40 | 46 | 52 | 57 | 56 | 48 | 40 | 34 | 28 | 41 |
| Avg Max Temp (°F) | 40 | 46 | 55 | 63 | 71 | 79 | 87 | 87 | 77 | 64 | 49 | 41 | 63 |
| Avg Precip (In.) | 1.95 | 1.61 | 1.87 | 1.6 | 1.72 | 1.17 | .55 | .71 | .78 | 1.43 | 2.23 | 2.07 | 17.7 |