Brookdale, California has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 7.2 °C (low) to 22 °C (high). Annual precipitation averages 1289.3 Millimeters. Brookdale is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Mar. 11 - Mar. 20 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 3.6 °C | 15.9 °C | 258.32 mm |
| February | 4.4 °C | 17 °C | 276.86 mm |
| March | 5.2 °C | 18.7 °C | 187.45 mm |
| April | 6.1 °C | 20.1 °C | 85.09 mm |
| May | 8 °C | 22.8 °C | 32.26 mm |
| June | 9.6 °C | 26.3 °C | 9.14 mm |
| July | 11.2 °C | 28 °C | 0.51 mm |
| August | 11.1 °C | 28.3 °C | 1.27 mm |
| September | 10.1 °C | 27.6 °C | 3.56 mm |
| October | 7.9 °C | 24.3 °C | 57.66 mm |
| November | 5.4 °C | 19.3 °C | 115.57 mm |
| December | 3.6 °C | 15.3 °C | 261.62 mm |
| Annual | 7.2 °C | 22 °C | 1289.31 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| Average Days With Frost | 30-40 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 | Normal |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |