Holtville, California has a Hot Desert Climate climate (Köppen classification: BWh). Average annual temperatures range from 58 °F (low) to 87.8 °F (high). Annual precipitation averages 2.5 Inches. Holtville is located in USDA Plant Hardiness Zone 10a.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 41.8 °F | 70.0 °F | 0.43 in. |
| February | 44.7 °F | 73.3 °F | 0.39 in. |
| March | 49.5 °F | 79.4 °F | 0.29 in. |
| April | 54.4 °F | 85.3 °F | 0.09 in. |
| May | 60.7 °F | 92.9 °F | 0.04 in. |
| June | 68.0 °F | 102.1 °F | 0.0 in. |
| July | 76.5 °F | 106.1 °F | 0.12 in. |
| August | 78.1 °F | 106.0 °F | 0.25 in. |
| September | 71.9 °F | 101.4 °F | 0.2 in. |
| October | 59.9 °F | 90.8 °F | 0.18 in. |
| November | 49.1 °F | 78.2 °F | 0.14 in. |
| December | 41.7 °F | 68.3 °F | 0.39 in. |
| Annual | 58 °F | 87.8 °F | 2.52 in. |
| Average First Frost Date | Frost Rare |
| Average Last Frost Date | |
| Average Days With Frost | Frost Rare |
| Plant Hardiness Zone | Zone 10a : 30°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 10a : 30°F to 25°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | BWh - Hot Desert Climate |