Hallsville, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 12.5 °C (low) to 24.8 °C (high). Annual precipitation averages 1263.6 Millimeters. Hallsville is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 1 - Mar. 10 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 2 °C | 14 °C | 105.41 mm |
| February | 3.9 °C | 16.3 °C | 104.9 mm |
| March | 7.8 °C | 20.6 °C | 127 mm |
| April | 11.8 °C | 24.8 °C | 112.01 mm |
| May | 17 °C | 28.6 °C | 123.44 mm |
| June | 21.2 °C | 32.3 °C | 113.54 mm |
| July | 22.8 °C | 34.3 °C | 74.17 mm |
| August | 22.3 °C | 34.6 °C | 74.42 mm |
| September | 18.7 °C | 31.5 °C | 93.73 mm |
| October | 12.4 °C | 25.8 °C | 112.52 mm |
| November | 6.9 °C | 19.4 °C | 101.09 mm |
| December | 3 °C | 14.8 °C | 121.41 mm |
| Annual | 12.5 °C | 24.8 °C | 1263.64 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 1 - Mar. 10 |
| Average Days With Frost | 30-40 Days |
| Plant Hardiness Zone | Zone 8b : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8b : -9.4°C to -6.7°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |