Milton-Freewater, Oregon has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 41.8 °F (low) to 64.2 °F (high). Annual precipitation averages 16.2 Inches. 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 | 28.9 °F | 41.8 °F | 1.82 in. |
| February | 30.7 °F | 46.9 °F | 1.45 in. |
| March | 35.2 °F | 55.8 °F | 1.77 in. |
| April | 39.8 °F | 63.0 °F | 1.64 in. |
| May | 46.4 °F | 71.8 °F | 1.74 in. |
| June | 52.2 °F | 78.7 °F | 1.24 in. |
| July | 57.9 °F | 89.2 °F | 0.33 in. |
| August | 57.3 °F | 88.5 °F | 0.4 in. |
| September | 49.7 °F | 78.8 °F | 0.62 in. |
| October | 40.7 °F | 64.4 °F | 1.23 in. |
| November | 33.5 °F | 49.8 °F | 1.87 in. |
| December | 28.7 °F | 41.1 °F | 2.12 in. |
| Annual | 41.8 °F | 64.2 °F | 16.23 in. |
| 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 : 5°F to 10°F |
| Plant Hardiness Zone - 2012 | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Csa - Hot-Summer Mediterranean Climate |