Parker, Washington has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 38.8 °F (low) to 63.9 °F (high). Annual precipitation averages 8.2 Inches. Parker 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 | 25.0 °F | 39.1 °F | 1.23 in. |
| February | 27.3 °F | 47.0 °F | 0.76 in. |
| March | 32.2 °F | 56.1 °F | 0.61 in. |
| April | 37.2 °F | 63.9 °F | 0.56 in. |
| May | 45.0 °F | 73.3 °F | 0.79 in. |
| June | 50.6 °F | 79.7 °F | 0.55 in. |
| July | 56.3 °F | 88.8 °F | 0.23 in. |
| August | 54.8 °F | 87.8 °F | 0.2 in. |
| September | 46.6 °F | 79.1 °F | 0.26 in. |
| October | 37.3 °F | 64.7 °F | 0.71 in. |
| November | 29.2 °F | 49.3 °F | 0.91 in. |
| December | 24.2 °F | 38.1 °F | 1.4 in. |
| Annual | 38.8 °F | 63.9 °F | 8.21 in. |
| 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 : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |