Starbuck, Washington has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 43.2 °F (low) to 65.4 °F (high). Annual precipitation averages 12.8 Inches. Starbuck is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 30.3 °F | 42.3 °F | 1.62 in. |
| February | 31.3 °F | 47.9 °F | 1.2 in. |
| March | 36.1 °F | 56.7 °F | 1.33 in. |
| April | 41.1 °F | 63.8 °F | 1.18 in. |
| May | 48.0 °F | 73.3 °F | 1.25 in. |
| June | 53.9 °F | 80.4 °F | 0.86 in. |
| July | 59.6 °F | 90.8 °F | 0.22 in. |
| August | 59.4 °F | 90.9 °F | 0.25 in. |
| September | 51.8 °F | 80.6 °F | 0.39 in. |
| October | 42.2 °F | 66.1 °F | 0.87 in. |
| November | 35.1 °F | 50.5 °F | 1.68 in. |
| December | 29.6 °F | 41.5 °F | 1.96 in. |
| Annual | 43.2 °F | 65.4 °F | 12.81 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 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 | Moderate Drought |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |