Spokane, Washington has a Humid Continental Climate - Dry Cool Summer climate (Köppen classification: Dsb). Average annual temperatures range from 38 °F (low) to 60 °F (high). Annual precipitation averages 18.1 Inches. Spokane is located in USDA Plant Hardiness Zone 7a. 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 | 25.4 °F | 36.6 °F | 2.17 in. |
| February | 26.3 °F | 41.7 °F | 1.54 in. |
| March | 30.3 °F | 50.5 °F | 2.0 in. |
| April | 35.6 °F | 58.9 °F | 1.47 in. |
| May | 43.1 °F | 68.5 °F | 1.68 in. |
| June | 49.4 °F | 75.1 °F | 1.5 in. |
| July | 54.3 °F | 86.0 °F | 0.48 in. |
| August | 53.0 °F | 85.9 °F | 0.44 in. |
| September | 45.4 °F | 75.8 °F | 0.62 in. |
| October | 36.9 °F | 60.4 °F | 1.33 in. |
| November | 30.6 °F | 45.0 °F | 2.24 in. |
| December | 25.6 °F | 36.1 °F | 2.6 in. |
| Annual | 38 °F | 60 °F | 18.07 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| 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 | Dsb - Humid Continental Climate - Dry Cool Summer |