Glenbrook, Nevada has a Humid Continental Climate - Dry Cool Summer climate (Köppen classification: Dsb). Average annual temperatures range from 1.1 °C (low) to 15 °C (high). Annual precipitation averages 476.3 Millimeters. Glenbrook is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -5 °C | 5.6 °C | 86.61 mm |
| February | -4.8 °C | 6.4 °C | 80.77 mm |
| March | -3 °C | 9.1 °C | 66.04 mm |
| April | -1.4 °C | 11.8 °C | 35.31 mm |
| May | 2.3 °C | 16.4 °C | 26.42 mm |
| June | 5.8 °C | 22.1 °C | 13.97 mm |
| July | 9.3 °C | 26.7 °C | 4.32 mm |
| August | 8.9 °C | 26.4 °C | 6.35 mm |
| September | 6.4 °C | 22.9 °C | 8.89 mm |
| October | 1.8 °C | 16.6 °C | 26.42 mm |
| November | -2.1 °C | 10 °C | 40.89 mm |
| December | -5 °C | 5.7 °C | 80.26 mm |
| Annual | 1.1 °C | 15 °C | 476.25 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 7b : -15°C to -12.2°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dsb - Humid Continental Climate - Dry Cool Summer |