Sierra Brooks, California has a Humid Continental Climate - Dry Cool Summer climate (Köppen classification: Dsb). Average annual temperatures range from 0.2 °C (low) to 17.4 °C (high). Annual precipitation averages 581.7 Millimeters. Sierra Brooks is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Jun. 1 - Jun. 10 through the first frost around Aug. 21 - Aug. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -6.6 °C | 6.7 °C | 103.89 mm |
| February | -5.3 °C | 8.4 °C | 96.77 mm |
| March | -3.1 °C | 11.4 °C | 78.74 mm |
| April | -1.1 °C | 14.6 °C | 37.34 mm |
| May | 2.2 °C | 19.4 °C | 40.64 mm |
| June | 5.6 °C | 25.1 °C | 12.19 mm |
| July | 8.9 °C | 30.2 °C | 7.11 mm |
| August | 7.6 °C | 29.7 °C | 7.37 mm |
| September | 4.6 °C | 26.1 °C | 10.41 mm |
| October | 0.2 °C | 19.3 °C | 31.5 mm |
| November | -4.1 °C | 11.7 °C | 50.55 mm |
| December | -6.6 °C | 6.2 °C | 105.16 mm |
| Annual | 0.2 °C | 17.4 °C | 581.67 mm |
| Average First Frost Date | Aug. 21 - Aug. 31 |
| Average Last Frost Date | Jun. 1 - Jun. 10 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dsb - Humid Continental Climate - Dry Cool Summer |