Descanso, California has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 7.1 °C (low) to 23.1 °C (high). Annual precipitation averages 593.4 Millimeters. Descanso 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. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 2.9 °C | 15.6 °C | 117.09 mm |
| February | 2.4 °C | 15.2 °C | 133.86 mm |
| March | 3.2 °C | 17.6 °C | 87.12 mm |
| April | 3.9 °C | 19.9 °C | 40.64 mm |
| May | 6.3 °C | 23.5 °C | 20.07 mm |
| June | 9.3 °C | 28.7 °C | 3.05 mm |
| July | 13.8 °C | 32.7 °C | 7.87 mm |
| August | 14.4 °C | 33.3 °C | 12.7 mm |
| September | 12.3 °C | 30.8 °C | 10.67 mm |
| October | 8.3 °C | 25.3 °C | 23.37 mm |
| November | 5.1 °C | 19.4 °C | 43.69 mm |
| December | 2.7 °C | 15.1 °C | 93.22 mm |
| Annual | 7.1 °C | 23.1 °C | 593.35 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 9a : -6.7°C to -3.9°C |
| Plant Hardiness Zone - 2012 | Zone 8b : -9.4°C to -6.7°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |