Barstow, Texas has a Hot Semi-Arid Climate climate (Köppen classification: BSh). Average annual temperatures range from 9.9 °C (low) to 27.6 °C (high). Annual precipitation averages 286 Millimeters. 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 | -1.4 °C | 16.1 °C | 13.97 mm |
| February | 0.8 °C | 19.4 °C | 11.43 mm |
| March | 4.5 °C | 23.9 °C | 10.92 mm |
| April | 8.9 °C | 28.9 °C | 12.45 mm |
| May | 14.6 °C | 33.3 °C | 26.42 mm |
| June | 19.8 °C | 37.4 °C | 28.96 mm |
| July | 21.5 °C | 37.2 °C | 43.18 mm |
| August | 20.9 °C | 36.7 °C | 38.61 mm |
| September | 16.8 °C | 32.8 °C | 48.51 mm |
| October | 10.2 °C | 28.2 °C | 24.38 mm |
| November | 2.9 °C | 21.3 °C | 12.7 mm |
| December | -0.8 °C | 16.3 °C | 14.48 mm |
| Annual | 9.9 °C | 27.6 °C | 286.01 mm |
| 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 : -12.2°C to -9.4°C |
| Plant Hardiness Zone - 2012 | Zone 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | BSh - Hot Semi-Arid Climate |