Wishram, Washington has a Humid Continental Climate - Dry Cool Summer climate (Köppen classification: Dsb). Average annual temperatures range from 43.6 °F (low) to 64.9 °F (high). Annual precipitation averages 12.3 Inches. Wishram is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 31.7 °F | 42.6 °F | 2.16 in. |
| February | 32.6 °F | 48.4 °F | 1.32 in. |
| March | 36.4 °F | 56.5 °F | 1.16 in. |
| April | 41.3 °F | 63.8 °F | 0.73 in. |
| May | 47.9 °F | 72.6 °F | 0.71 in. |
| June | 53.4 °F | 78.5 °F | 0.42 in. |
| July | 59.3 °F | 87.6 °F | 0.17 in. |
| August | 59.0 °F | 88.1 °F | 0.19 in. |
| September | 51.5 °F | 80.3 °F | 0.32 in. |
| October | 42.8 °F | 66.3 °F | 0.85 in. |
| November | 35.8 °F | 51.3 °F | 1.77 in. |
| December | 31.7 °F | 42.4 °F | 2.45 in. |
| Annual | 43.6 °F | 64.9 °F | 12.25 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 8a : 10°F to 15°F |
| Plant Hardiness Zone - 2012 | Zone 7b : 5°F to 10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dsb - Humid Continental Climate - Dry Cool Summer |