Ocotillo, California has a Cold Desert Climate climate (Köppen classification: BWk). Average annual temperatures range from 14 °C (low) to 31.1 °C (high). Annual precipitation averages 85.1 Millimeters. Ocotillo is located in USDA Plant Hardiness Zone 10a.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 5.9 °C | 21.1 °C | 16 mm |
| February | 7.5 °C | 22.3 °C | 13.97 mm |
| March | 10.1 °C | 25.2 °C | 6.35 mm |
| April | 12.3 °C | 29.7 °C | 1.27 mm |
| May | 15.5 °C | 34.5 °C | 3.05 mm |
| June | 19.1 °C | 40 °C | 1.52 mm |
| July | 23.2 °C | 41.4 °C | 8.13 mm |
| August | 23.9 °C | 42.2 °C | 5.08 mm |
| September | 21 °C | 38.5 °C | 4.32 mm |
| October | 15.1 °C | 32.4 °C | 4.06 mm |
| November | 9.1 °C | 25.6 °C | 5.08 mm |
| December | 5.1 °C | 20.2 °C | 16.26 mm |
| Annual | 14 °C | 31.1 °C | 85.09 mm |
| Average First Frost Date | No Frost |
| Average Last Frost Date | |
| Average Days With Frost | Frost Free |
| Plant Hardiness Zone | Zone 10a : -1.1°C to 1.7°C |
| Plant Hardiness Zone - 2012 | Zone 9b : -3.9°C to -1.1°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | BWk - Cold Desert Climate |