Glenbrook, Nevada has a Humid Continental Climate - Dry Cool Summer climate (Köppen classification: Dsb). Average annual temperatures range from 34 °F (low) to 59 °F (high). Annual precipitation averages 18.8 Inches. 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 | 23.0 °F | 42.1 °F | 3.41 in. |
| February | 23.4 °F | 43.6 °F | 3.18 in. |
| March | 26.6 °F | 48.3 °F | 2.6 in. |
| April | 29.4 °F | 53.2 °F | 1.39 in. |
| May | 36.2 °F | 61.6 °F | 1.04 in. |
| June | 42.4 °F | 71.8 °F | 0.55 in. |
| July | 48.7 °F | 80.1 °F | 0.17 in. |
| August | 48.1 °F | 79.5 °F | 0.25 in. |
| September | 43.5 °F | 73.2 °F | 0.35 in. |
| October | 35.2 °F | 61.8 °F | 1.04 in. |
| November | 28.2 °F | 50.0 °F | 1.61 in. |
| December | 23.0 °F | 42.2 °F | 3.16 in. |
| Annual | 34 °F | 59 °F | 18.75 in. |
| 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 : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 7b : 5°F to 10°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dsb - Humid Continental Climate - Dry Cool Summer |