Grandview, Washington has a Cold Desert Climate climate (Köppen classification: BWk). Average annual temperatures range from 39.1 °F (low) to 64.1 °F (high). Annual precipitation averages 7.8 Inches. Grandview is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 26.6 °F | 39.7 °F | 1.07 in. |
| February | 27.9 °F | 47.0 °F | 0.73 in. |
| March | 32.3 °F | 56.4 °F | 0.6 in. |
| April | 36.8 °F | 64.0 °F | 0.61 in. |
| May | 44.5 °F | 73.4 °F | 0.72 in. |
| June | 50.0 °F | 79.9 °F | 0.66 in. |
| July | 55.0 °F | 89.0 °F | 0.26 in. |
| August | 54.0 °F | 87.8 °F | 0.2 in. |
| September | 47.1 °F | 78.7 °F | 0.26 in. |
| October | 38.3 °F | 64.4 °F | 0.79 in. |
| November | 30.6 °F | 49.4 °F | 0.88 in. |
| December | 26.0 °F | 39.1 °F | 1.06 in. |
| Annual | 39.1 °F | 64.1 °F | 7.84 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7a : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | BWk - Cold Desert Climate |