Window Rock, Arizona has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 1.2 °C (low) to 18 °C (high). Annual precipitation averages 290.6 Millimeters. 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 | -8.6 °C | 6.6 °C | 17.02 mm |
| February | -6.4 °C | 8.5 °C | 16 mm |
| March | -4.1 °C | 12.7 °C | 18.29 mm |
| April | -0.4 °C | 16.9 °C | 12.7 mm |
| May | 3.9 °C | 21.8 °C | 15.49 mm |
| June | 8.9 °C | 28.2 °C | 8.13 mm |
| July | 12.9 °C | 29.8 °C | 42.93 mm |
| August | 12.2 °C | 28.2 °C | 52.83 mm |
| September | 7.9 °C | 25 °C | 40.39 mm |
| October | 0.9 °C | 19.2 °C | 24.64 mm |
| November | -4.4 °C | 12.1 °C | 21.34 mm |
| December | -8.2 °C | 6.8 °C | 20.83 mm |
| Annual | 1.2 °C | 18 °C | 290.59 mm |
| 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 : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |