Warden, Washington has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 38.5 °F (low) to 61.5 °F (high). Annual precipitation averages 8.9 Inches. 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 | 24.7 °F | 36.5 °F | 1.21 in. |
| February | 27.4 °F | 43.6 °F | 0.81 in. |
| March | 31.7 °F | 53.5 °F | 0.91 in. |
| April | 36.2 °F | 61.6 °F | 0.73 in. |
| May | 43.5 °F | 70.9 °F | 0.75 in. |
| June | 49.1 °F | 77.5 °F | 0.67 in. |
| July | 55.0 °F | 86.7 °F | 0.27 in. |
| August | 54.5 °F | 86.1 °F | 0.21 in. |
| September | 47.2 °F | 77.0 °F | 0.29 in. |
| October | 37.7 °F | 62.2 °F | 0.79 in. |
| November | 30.0 °F | 46.5 °F | 1.05 in. |
| December | 24.5 °F | 36.1 °F | 1.19 in. |
| Annual | 38.5 °F | 61.5 °F | 8.88 in. |
| 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 : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |