Liberty Lake, Washington has a Humid Continental Climate - Dry Cool Summer climate (Köppen classification: Dsb). Average annual temperatures range from 3 °C (low) to 15 °C (high). Annual precipitation averages 483.6 Millimeters. Liberty Lake 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 | -3.7 °C | 2.4 °C | 47.24 mm |
| February | -3.6 °C | 4.9 °C | 44.2 mm |
| March | -1.1 °C | 9.7 °C | 48.26 mm |
| April | 1.7 °C | 14.2 °C | 45.97 mm |
| May | 5.8 °C | 19.7 °C | 53.59 mm |
| June | 9.1 °C | 23.2 °C | 41.4 mm |
| July | 11.8 °C | 29.1 °C | 13.97 mm |
| August | 11.4 °C | 29.2 °C | 17.53 mm |
| September | 7.2 °C | 23.7 °C | 22.35 mm |
| October | 2.5 °C | 15.2 °C | 39.37 mm |
| November | -0.9 °C | 6.9 °C | 56.39 mm |
| December | -3.8 °C | 2.1 °C | 53.34 mm |
| Annual | 3 °C | 15 °C | 483.61 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 125-150 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 |