Manson, Washington has a Humid Continental Climate - Dry Cool Summer climate (Köppen classification: Dsb). Average annual temperatures range from 4.1 °C (low) to 16.2 °C (high). Annual precipitation averages 292.1 Millimeters. 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 | -4.8 °C | 1.2 °C | 42.67 mm |
| February | -3.4 °C | 5.1 °C | 29.21 mm |
| March | -0.2 °C | 11.3 °C | 28.19 mm |
| April | 3.2 °C | 16.7 °C | 19.56 mm |
| May | 7.3 °C | 22.2 °C | 26.16 mm |
| June | 10.7 °C | 25.7 °C | 18.54 mm |
| July | 14 °C | 31 °C | 6.86 mm |
| August | 13.8 °C | 30.7 °C | 7.62 mm |
| September | 9.5 °C | 25.4 °C | 7.62 mm |
| October | 3.9 °C | 16.5 °C | 22.61 mm |
| November | -0.7 °C | 7.3 °C | 36.32 mm |
| December | -4.4 °C | 1.4 °C | 46.74 mm |
| Annual | 4.1 °C | 16.2 °C | 292.1 mm |
| 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 : -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 |