Manson, Washington has a Humid Continental Climate - Dry Cool Summer climate (Köppen classification: Dsb). Average annual temperatures range from 39.4 °F (low) to 61.2 °F (high). Annual precipitation averages 11.5 Inches. Manson is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 23.4 °F | 34.1 °F | 1.68 in. |
| February | 25.9 °F | 41.1 °F | 1.15 in. |
| March | 31.7 °F | 52.4 °F | 1.11 in. |
| April | 37.7 °F | 62.0 °F | 0.77 in. |
| May | 45.1 °F | 71.9 °F | 1.03 in. |
| June | 51.3 °F | 78.3 °F | 0.73 in. |
| July | 57.2 °F | 87.8 °F | 0.27 in. |
| August | 56.9 °F | 87.2 °F | 0.3 in. |
| September | 49.1 °F | 77.8 °F | 0.3 in. |
| October | 39.1 °F | 61.7 °F | 0.89 in. |
| November | 30.8 °F | 45.1 °F | 1.43 in. |
| December | 24.1 °F | 34.5 °F | 1.84 in. |
| Annual | 39.4 °F | 61.2 °F | 11.5 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 100-125 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 | Moderate Drought |
| Köppen Climate Classification | Dsb - Humid Continental Climate - Dry Cool Summer |