Joshua Tree, California has a Hot Semi-Arid Climate climate (Köppen classification: BSh). Average annual temperatures range from 10.4 °C (low) to 26.6 °C (high). Annual precipitation averages 152.2 Millimeters. Joshua Tree is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Mar. 11 - Mar. 20 through the first frost around Nov. 21 - Nov. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 2.1 °C | 16.1 °C | 30.48 mm |
| February | 2.9 °C | 17.7 °C | 31.75 mm |
| March | 5.5 °C | 21.2 °C | 17.53 mm |
| April | 8.2 °C | 25.1 °C | 6.35 mm |
| May | 12.3 °C | 30.1 °C | 2.29 mm |
| June | 16.8 °C | 35.3 °C | 1.02 mm |
| July | 21.1 °C | 38.1 °C | 7.62 mm |
| August | 20.7 °C | 37.6 °C | 7.87 mm |
| September | 17.1 °C | 34.2 °C | 7.62 mm |
| October | 10.8 °C | 27.7 °C | 9.91 mm |
| November | 5.3 °C | 20.9 °C | 8.13 mm |
| December | 1.5 °C | 15.3 °C | 21.59 mm |
| Annual | 10.4 °C | 26.6 °C | 152.16 mm |
| Average First Frost Date | Nov. 21 - Nov. 30 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| Average Days With Frost | 30-40 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 | BSh - Hot Semi-Arid Climate |