Hearne, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 13.5 °C (low) to 26.1 °C (high). Annual precipitation averages 993.1 Millimeters. Hearne is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Feb. 21 - Feb. 29 through the first frost around Nov. 21 - Nov. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 3.4 °C | 15.9 °C | 89.92 mm |
| February | 5.4 °C | 17.9 °C | 73.66 mm |
| March | 9 °C | 21.9 °C | 82.8 mm |
| April | 13 °C | 25.8 °C | 75.18 mm |
| May | 18 °C | 29.6 °C | 107.7 mm |
| June | 21.8 °C | 33.2 °C | 80.26 mm |
| July | 22.9 °C | 35.1 °C | 46.23 mm |
| August | 22.7 °C | 35.6 °C | 65.02 mm |
| September | 19.6 °C | 32.5 °C | 90.68 mm |
| October | 13.8 °C | 27.4 °C | 113.03 mm |
| November | 8.3 °C | 21.4 °C | 77.22 mm |
| December | 4.3 °C | 16.8 °C | 91.44 mm |
| Annual | 13.5 °C | 26.1 °C | 993.14 mm |
| Average First Frost Date | Nov. 21 - Nov. 30 |
| Average Last Frost Date | Feb. 21 - Feb. 29 |
| Average Days With Frost | 20-30 Days |
| Plant Hardiness Zone | Zone 9a : -6.7°C to -3.9°C |
| Plant Hardiness Zone - 2012 | Zone 8b : -9.4°C to -6.7°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |