Brooktrails, California has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 5.3 °C (low) to 20.9 °C (high). Annual precipitation averages 1390.4 Millimeters. Brooktrails is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 2 °C | 13.1 °C | 269.49 mm |
| February | 1.9 °C | 14.4 °C | 227.08 mm |
| March | 2.6 °C | 15.9 °C | 184.66 mm |
| April | 3.6 °C | 17.6 °C | 101.35 mm |
| May | 5.6 °C | 21.6 °C | 53.34 mm |
| June | 8.4 °C | 25.9 °C | 17.53 mm |
| July | 10.6 °C | 30.4 °C | 1.27 mm |
| August | 10.3 °C | 30.7 °C | 2.03 mm |
| September | 8.5 °C | 28.9 °C | 7.37 mm |
| October | 5.4 °C | 23.8 °C | 69.85 mm |
| November | 3.3 °C | 16.7 °C | 148.08 mm |
| December | 1.7 °C | 12.3 °C | 308.36 mm |
| Annual | 5.3 °C | 20.9 °C | 1390.41 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 40-50 Days |
| Plant Hardiness Zone | Zone 9a : -6.7°C to -3.9°C |
| Plant Hardiness Zone - 2012 | Zone 9a : -6.7°C to -3.9°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |