Brooktrails, California has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 41.6 °F (low) to 69.7 °F (high). Annual precipitation averages 54.7 Inches. 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 | 35.6 °F | 55.6 °F | 10.61 in. |
| February | 35.4 °F | 57.9 °F | 8.94 in. |
| March | 36.6 °F | 60.7 °F | 7.27 in. |
| April | 38.4 °F | 63.7 °F | 3.99 in. |
| May | 42.1 °F | 70.8 °F | 2.1 in. |
| June | 47.1 °F | 78.7 °F | 0.69 in. |
| July | 51.0 °F | 86.8 °F | 0.05 in. |
| August | 50.5 °F | 87.3 °F | 0.08 in. |
| September | 47.3 °F | 84.0 °F | 0.29 in. |
| October | 41.7 °F | 74.9 °F | 2.75 in. |
| November | 37.9 °F | 62.0 °F | 5.83 in. |
| December | 35.0 °F | 54.2 °F | 12.14 in. |
| Annual | 41.6 °F | 69.7 °F | 54.74 in. |
| 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 : 20°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 9a : 20°F to 25°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |