Descanso, California has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 44.7 °F (low) to 73.6 °F (high). Annual precipitation averages 23.4 Inches. 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 | 37.3 °F | 60.0 °F | 4.61 in. |
| February | 36.4 °F | 59.3 °F | 5.27 in. |
| March | 37.7 °F | 63.7 °F | 3.43 in. |
| April | 39.1 °F | 67.9 °F | 1.6 in. |
| May | 43.3 °F | 74.3 °F | 0.79 in. |
| June | 48.7 °F | 83.7 °F | 0.12 in. |
| July | 56.8 °F | 90.8 °F | 0.31 in. |
| August | 57.9 °F | 91.9 °F | 0.5 in. |
| September | 54.1 °F | 87.4 °F | 0.42 in. |
| October | 47.0 °F | 77.6 °F | 0.92 in. |
| November | 41.1 °F | 67.0 °F | 1.72 in. |
| December | 36.8 °F | 59.1 °F | 3.67 in. |
| Annual | 44.7 °F | 73.6 °F | 23.36 in. |
| 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 : 20°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 8b : 15°F to 20°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |