Twentynine Palms, California has a Hot Desert Climate climate (Köppen classification: BWh). Average annual temperatures range from 12.4 °C (low) to 28.2 °C (high). Annual precipitation averages 82.3 Millimeters. Twentynine Palms is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Feb. 1 - Feb. 10 through the first frost around Dec. 1 - Dec. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 3.6 °C | 17.3 °C | 11.18 mm |
| February | 4.6 °C | 19.1 °C | 14.73 mm |
| March | 7.6 °C | 22.9 °C | 7.11 mm |
| April | 10.3 °C | 26.7 °C | 2.29 mm |
| May | 14.8 °C | 31.8 °C | 0.51 mm |
| June | 19.4 °C | 37.2 °C | 0 mm |
| July | 23.4 °C | 40 °C | 7.37 mm |
| August | 23.1 °C | 39.3 °C | 13.21 mm |
| September | 19.3 °C | 35.7 °C | 6.6 mm |
| October | 12.8 °C | 29.2 °C | 3.81 mm |
| November | 6.8 °C | 22.1 °C | 4.32 mm |
| December | 2.8 °C | 16.6 °C | 11.18 mm |
| Annual | 12.4 °C | 28.2 °C | 82.31 mm |
| Average First Frost Date | Dec. 1 - Dec. 10 |
| Average Last Frost Date | Feb. 1 - Feb. 10 |
| Average Days With Frost | 10-20 Days |
| Plant Hardiness Zone | Zone 9a : -6.7°C to -3.9°C |
| Plant Hardiness Zone - 2012 | Zone 9a : -6.7°C to -3.9°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | BWh - Hot Desert Climate |