Warden, Washington has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 3.6 °C (low) to 16.4 °C (high). Annual precipitation averages 225.6 Millimeters. Warden is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -4.1 °C | 2.5 °C | 30.73 mm |
| February | -2.6 °C | 6.4 °C | 20.57 mm |
| March | -0.2 °C | 11.9 °C | 23.11 mm |
| April | 2.3 °C | 16.4 °C | 18.54 mm |
| May | 6.4 °C | 21.6 °C | 19.05 mm |
| June | 9.5 °C | 25.3 °C | 17.02 mm |
| July | 12.8 °C | 30.4 °C | 6.86 mm |
| August | 12.5 °C | 30.1 °C | 5.33 mm |
| September | 8.4 °C | 25 °C | 7.37 mm |
| October | 3.2 °C | 16.8 °C | 20.07 mm |
| November | -1.1 °C | 8.1 °C | 26.67 mm |
| December | -4.2 °C | 2.3 °C | 30.23 mm |
| Annual | 3.6 °C | 16.4 °C | 225.55 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| 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 | BSk - Cold Semi-Arid Climate |