Holtville, California has a Hot Desert Climate climate (Köppen classification: BWh). Average annual temperatures range from 14.5 °C (low) to 31 °C (high). Annual precipitation averages 64 Millimeters. Holtville is located in USDA Plant Hardiness Zone 10a.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 5.4 °C | 21.1 °C | 10.92 mm |
| February | 7.1 °C | 22.9 °C | 9.91 mm |
| March | 9.7 °C | 26.3 °C | 7.37 mm |
| April | 12.4 °C | 29.6 °C | 2.29 mm |
| May | 15.9 °C | 33.8 °C | 1.02 mm |
| June | 20 °C | 38.9 °C | 0 mm |
| July | 24.7 °C | 41.2 °C | 3.05 mm |
| August | 25.6 °C | 41.1 °C | 6.35 mm |
| September | 22.2 °C | 38.6 °C | 5.08 mm |
| October | 15.5 °C | 32.7 °C | 4.57 mm |
| November | 9.5 °C | 25.7 °C | 3.56 mm |
| December | 5.4 °C | 20.2 °C | 9.91 mm |
| Annual | 14.5 °C | 31 °C | 64.03 mm |
| Average First Frost Date | Frost Rare |
| Average Last Frost Date | |
| Average Days With Frost | Frost Rare |
| Plant Hardiness Zone | Zone 10a : -1.1°C to 1.7°C |
| Plant Hardiness Zone - 2012 | Zone 10a : -1.1°C to 1.7°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | BWh - Hot Desert Climate |