Hempstead, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 57.6 °F (low) to 79.3 °F (high). Annual precipitation averages 46.5 Inches. 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 | 40.4 °F | 61.8 °F | 3.63 in. |
| February | 44.1 °F | 65.5 °F | 2.98 in. |
| March | 50.5 °F | 72.0 °F | 3.39 in. |
| April | 57.1 °F | 78.7 °F | 3.45 in. |
| May | 65.2 °F | 85.5 °F | 5.37 in. |
| June | 71.3 °F | 91.3 °F | 4.41 in. |
| July | 73.1 °F | 94.0 °F | 2.79 in. |
| August | 72.6 °F | 95.5 °F | 3.64 in. |
| September | 67.9 °F | 90.3 °F | 4.01 in. |
| October | 58.0 °F | 82.1 °F | 4.9 in. |
| November | 48.8 °F | 71.5 °F | 4.29 in. |
| December | 42.0 °F | 63.7 °F | 3.68 in. |
| Annual | 57.6 °F | 79.3 °F | 46.54 in. |
| 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 : 20°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 9a : 20°F to 25°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |