Summitview, Washington has a Humid Continental Climate - Dry Cool Summer climate (Köppen classification: Dsb). Average annual temperatures range from 3.1 °C (low) to 16.8 °C (high). Annual precipitation averages 246.6 Millimeters. Summitview is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -4.5 °C | 3.4 °C | 41.15 mm |
| February | -3.2 °C | 7.4 °C | 26.92 mm |
| March | -0.7 °C | 12.2 °C | 21.34 mm |
| April | 2.1 °C | 16.6 °C | 16.51 mm |
| May | 6.3 °C | 21.8 °C | 21.84 mm |
| June | 9.6 °C | 25.5 °C | 13.72 mm |
| July | 12.7 °C | 30.6 °C | 7.11 mm |
| August | 12.1 °C | 30.1 °C | 4.57 mm |
| September | 7.7 °C | 25.3 °C | 8.64 mm |
| October | 2.4 °C | 17.2 °C | 20.07 mm |
| November | -2.1 °C | 8.8 °C | 26.42 mm |
| December | -5 °C | 2.8 °C | 38.35 mm |
| Annual | 3.1 °C | 16.8 °C | 246.64 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 11 - May 20 |
| 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 | Dsb - Humid Continental Climate - Dry Cool Summer |