Hempstead, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 14.2 °C (low) to 26.3 °C (high). Annual precipitation averages 1182.1 Millimeters. Hempstead is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Mar. 1 - Mar. 10 through the first frost around Nov. 21 - Nov. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 4.7 °C | 16.6 °C | 92.2 mm |
| February | 6.7 °C | 18.6 °C | 75.69 mm |
| March | 10.3 °C | 22.2 °C | 86.11 mm |
| April | 13.9 °C | 25.9 °C | 87.63 mm |
| May | 18.4 °C | 29.7 °C | 136.4 mm |
| June | 21.8 °C | 32.9 °C | 112.01 mm |
| July | 22.8 °C | 34.4 °C | 70.87 mm |
| August | 22.6 °C | 35.3 °C | 92.46 mm |
| September | 19.9 °C | 32.4 °C | 101.85 mm |
| October | 14.4 °C | 27.8 °C | 124.46 mm |
| November | 9.3 °C | 21.9 °C | 108.97 mm |
| December | 5.6 °C | 17.6 °C | 93.47 mm |
| Annual | 14.2 °C | 26.3 °C | 1182.12 mm |
| Average First Frost Date | Nov. 21 - Nov. 30 |
| Average Last Frost Date | Mar. 1 - Mar. 10 |
| Average Days With Frost | 20-30 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 | Cfa - Humid Subtropical Climate |