Basin City, Washington has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 4.6 °C (low) to 17.8 °C (high). Annual precipitation averages 221.2 Millimeters. Basin City is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -2.7 °C | 4.1 °C | 30.23 mm |
| February | -1.9 °C | 8 °C | 20.83 mm |
| March | 0.7 °C | 13.4 °C | 20.07 mm |
| April | 3.3 °C | 17.9 °C | 19.05 mm |
| May | 7.3 °C | 23.1 °C | 19.05 mm |
| June | 10.7 °C | 26.6 °C | 17.53 mm |
| July | 13.8 °C | 31.7 °C | 5.33 mm |
| August | 13.5 °C | 31.1 °C | 5.33 mm |
| September | 9.3 °C | 26.1 °C | 7.37 mm |
| October | 4.2 °C | 17.9 °C | 19.81 mm |
| November | -0.2 °C | 9.3 °C | 25.91 mm |
| December | -2.9 °C | 3.8 °C | 30.73 mm |
| Annual | 4.6 °C | 17.8 °C | 221.24 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |