Grandview, Washington has a Cold Desert Climate climate (Köppen classification: BWk). Average annual temperatures range from 3.9 °C (low) to 17.8 °C (high). Annual precipitation averages 199.1 Millimeters. 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 | -3 °C | 4.3 °C | 27.18 mm |
| February | -2.3 °C | 8.3 °C | 18.54 mm |
| March | 0.2 °C | 13.6 °C | 15.24 mm |
| April | 2.7 °C | 17.8 °C | 15.49 mm |
| May | 6.9 °C | 23 °C | 18.29 mm |
| June | 10 °C | 26.6 °C | 16.76 mm |
| July | 12.8 °C | 31.7 °C | 6.6 mm |
| August | 12.2 °C | 31 °C | 5.08 mm |
| September | 8.4 °C | 25.9 °C | 6.6 mm |
| October | 3.5 °C | 18 °C | 20.07 mm |
| November | -0.8 °C | 9.7 °C | 22.35 mm |
| December | -3.3 °C | 3.9 °C | 26.92 mm |
| Annual | 3.9 °C | 17.8 °C | 199.12 mm |
| 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 : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | BWk - Cold Desert Climate |