Barstow, Texas has a Hot Semi-Arid Climate climate (Köppen classification: BSh). Average annual temperatures range from 49.8 °F (low) to 81.7 °F (high). Annual precipitation averages 11.3 Inches. Barstow is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 29.4 °F | 60.9 °F | 0.55 in. |
| February | 33.5 °F | 66.9 °F | 0.45 in. |
| March | 40.1 °F | 75.1 °F | 0.43 in. |
| April | 48.1 °F | 84.1 °F | 0.49 in. |
| May | 58.2 °F | 91.9 °F | 1.04 in. |
| June | 67.7 °F | 99.3 °F | 1.14 in. |
| July | 70.7 °F | 98.9 °F | 1.7 in. |
| August | 69.7 °F | 98.1 °F | 1.52 in. |
| September | 62.3 °F | 91.0 °F | 1.91 in. |
| October | 50.4 °F | 82.7 °F | 0.96 in. |
| November | 37.3 °F | 70.3 °F | 0.5 in. |
| December | 30.6 °F | 61.4 °F | 0.57 in. |
| Annual | 49.8 °F | 81.7 °F | 11.26 in. |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8a : 10°F to 15°F |
| Plant Hardiness Zone - 2012 | Zone 8a : 10°F to 15°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | BSh - Hot Semi-Arid Climate |