Yakima, Washington has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 3.5 °C (low) to 17.6 °C (high). Annual precipitation averages 212.6 Millimeters. Yakima is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -4.2 °C | 3.8 °C | 31.24 mm |
| February | -2.8 °C | 8.1 °C | 21.08 mm |
| March | -0.3 °C | 13.1 °C | 18.29 mm |
| April | 2.5 °C | 17.4 °C | 15.49 mm |
| May | 6.9 °C | 22.7 °C | 21.34 mm |
| June | 10.1 °C | 26.3 °C | 12.95 mm |
| July | 13.2 °C | 31.4 °C | 6.35 mm |
| August | 12.4 °C | 30.9 °C | 4.83 mm |
| September | 8 °C | 26.1 °C | 7.37 mm |
| October | 2.7 °C | 18.1 °C | 17.02 mm |
| November | -1.8 °C | 9.4 °C | 21.84 mm |
| December | -4.6 °C | 3.3 °C | 34.8 mm |
| Annual | 3.5 °C | 17.6 °C | 212.6 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |