Milton-Freewater, Oregon has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 5.4 °C (low) to 17.9 °C (high). Annual precipitation averages 412.3 Millimeters. Milton-Freewater is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -1.7 °C | 5.4 °C | 46.23 mm |
| February | -0.7 °C | 8.3 °C | 36.83 mm |
| March | 1.8 °C | 13.2 °C | 44.96 mm |
| April | 4.3 °C | 17.2 °C | 41.66 mm |
| May | 8 °C | 22.1 °C | 44.2 mm |
| June | 11.2 °C | 25.9 °C | 31.5 mm |
| July | 14.4 °C | 31.8 °C | 8.38 mm |
| August | 14.1 °C | 31.4 °C | 10.16 mm |
| September | 9.8 °C | 26 °C | 15.75 mm |
| October | 4.8 °C | 18 °C | 31.24 mm |
| November | 0.8 °C | 9.9 °C | 47.5 mm |
| December | -1.8 °C | 5.1 °C | 53.85 mm |
| Annual | 5.4 °C | 17.9 °C | 412.26 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 7b : -15°C to -12.2°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Csa - Hot-Summer Mediterranean Climate |