Starbuck, Washington has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 6.2 °C (low) to 18.6 °C (high). Annual precipitation averages 325.4 Millimeters. 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 | -0.9 °C | 5.7 °C | 41.15 mm |
| February | -0.4 °C | 8.8 °C | 30.48 mm |
| March | 2.3 °C | 13.7 °C | 33.78 mm |
| April | 5.1 °C | 17.7 °C | 29.97 mm |
| May | 8.9 °C | 22.9 °C | 31.75 mm |
| June | 12.2 °C | 26.9 °C | 21.84 mm |
| July | 15.3 °C | 32.7 °C | 5.59 mm |
| August | 15.2 °C | 32.7 °C | 6.35 mm |
| September | 11 °C | 27 °C | 9.91 mm |
| October | 5.7 °C | 18.9 °C | 22.1 mm |
| November | 1.7 °C | 10.3 °C | 42.67 mm |
| December | -1.3 °C | 5.3 °C | 49.78 mm |
| Annual | 6.2 °C | 18.6 °C | 325.37 mm |
| 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 : -15°C to -12.2°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |