Malden, Washington has a Humid Continental Climate - Dry Cool Summer climate (Köppen classification: Dsb). Average annual temperatures range from 36.5 °F (low) to 59.5 °F (high). Annual precipitation averages 17.8 Inches. Malden is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 25.0 °F | 37.1 °F | 2.16 in. |
| February | 26.2 °F | 41.8 °F | 1.6 in. |
| March | 30.2 °F | 49.9 °F | 1.85 in. |
| April | 34.7 °F | 57.9 °F | 1.53 in. |
| May | 41.2 °F | 67.1 °F | 1.6 in. |
| June | 46.8 °F | 73.5 °F | 1.31 in. |
| July | 50.9 °F | 84.9 °F | 0.51 in. |
| August | 50.4 °F | 85.2 °F | 0.42 in. |
| September | 43.2 °F | 75.5 °F | 0.58 in. |
| October | 35.1 °F | 60.5 °F | 1.49 in. |
| November | 29.4 °F | 45.1 °F | 2.28 in. |
| December | 24.4 °F | 36.0 °F | 2.44 in. |
| Annual | 36.5 °F | 59.5 °F | 17.77 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dsb - Humid Continental Climate - Dry Cool Summer |