Stephenville, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 52.8 °F (low) to 76.2 °F (high). Annual precipitation averages 33.9 Inches. Stephenville is located in USDA Plant Hardiness Zone 8b. 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 | 33.0 °F | 57.1 °F | 1.92 in. |
| February | 36.7 °F | 60.9 °F | 2.28 in. |
| March | 44.0 °F | 68.1 °F | 2.93 in. |
| April | 51.6 °F | 75.9 °F | 2.81 in. |
| May | 61.0 °F | 82.8 °F | 4.57 in. |
| June | 68.4 °F | 89.8 °F | 3.6 in. |
| July | 71.9 °F | 94.1 °F | 1.85 in. |
| August | 71.2 °F | 94.7 °F | 2.66 in. |
| September | 64.2 °F | 87.5 °F | 3.36 in. |
| October | 53.5 °F | 78.1 °F | 3.57 in. |
| November | 43.0 °F | 66.5 °F | 2.25 in. |
| December | 35.0 °F | 58.4 °F | 2.05 in. |
| Annual | 52.8 °F | 76.2 °F | 33.85 in. |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 40-50 Days |
| Plant Hardiness Zone | Zone 8b : 15°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 8a : 10°F to 15°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |