Hansville, Washington has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 6.4 °C (low) to 14.9 °C (high). Annual precipitation averages 787.9 Millimeters. Hansville is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 2.3 °C | 8.1 °C | 106.17 mm |
| February | 2.2 °C | 9.3 °C | 77.47 mm |
| March | 3.4 °C | 11.5 °C | 97.28 mm |
| April | 5.1 °C | 13.7 °C | 57.4 mm |
| May | 7.8 °C | 17.2 °C | 38.35 mm |
| June | 10 °C | 19.7 °C | 40.64 mm |
| July | 11.5 °C | 22.5 °C | 21.59 mm |
| August | 11.6 °C | 23.1 °C | 24.89 mm |
| September | 9.7 °C | 20.1 °C | 38.1 mm |
| October | 6.8 °C | 14.8 °C | 60.45 mm |
| November | 4.1 °C | 10.5 °C | 128.52 mm |
| December | 2.2 °C | 7.7 °C | 97.03 mm |
| Annual | 6.4 °C | 14.9 °C | 787.89 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 40-50 Days |
| Plant Hardiness Zone | Zone 9a : -6.7°C to -3.9°C |
| Plant Hardiness Zone - 2012 | Zone 8b : -9.4°C to -6.7°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |