Window Rock, Arizona has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 34.2 °F (low) to 64.4 °F (high). Annual precipitation averages 11.4 Inches. Window Rock is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Jun. 1 - Jun. 10 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 16.6 °F | 43.9 °F | 0.67 in. |
| February | 20.4 °F | 47.3 °F | 0.63 in. |
| March | 24.7 °F | 54.8 °F | 0.72 in. |
| April | 31.2 °F | 62.4 °F | 0.5 in. |
| May | 39.0 °F | 71.3 °F | 0.61 in. |
| June | 48.0 °F | 82.8 °F | 0.32 in. |
| July | 55.2 °F | 85.7 °F | 1.69 in. |
| August | 54.0 °F | 82.7 °F | 2.08 in. |
| September | 46.2 °F | 77.0 °F | 1.59 in. |
| October | 33.7 °F | 66.6 °F | 0.97 in. |
| November | 24.1 °F | 53.7 °F | 0.84 in. |
| December | 17.3 °F | 44.3 °F | 0.82 in. |
| Annual | 34.2 °F | 64.4 °F | 11.44 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | Jun. 1 - Jun. 10 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |