Clarksville, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 52.1 °F (low) to 74.8 °F (high). Annual precipitation averages 49.2 Inches. Clarksville is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 11 - Mar. 20 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 32.4 °F | 54.4 °F | 3.33 in. |
| February | 35.9 °F | 58.6 °F | 3.75 in. |
| March | 43.1 °F | 66.5 °F | 4.83 in. |
| April | 50.5 °F | 74.0 °F | 4.55 in. |
| May | 60.4 °F | 81.1 °F | 5.38 in. |
| June | 68.5 °F | 89.1 °F | 3.85 in. |
| July | 71.6 °F | 93.3 °F | 2.96 in. |
| August | 70.5 °F | 93.9 °F | 2.76 in. |
| September | 64.0 °F | 87.6 °F | 3.92 in. |
| October | 52.0 °F | 77.1 °F | 4.91 in. |
| November | 42.0 °F | 65.6 °F | 4.27 in. |
| December | 34.5 °F | 56.4 °F | 4.64 in. |
| Annual | 52.1 °F | 74.8 °F | 49.15 in. |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| 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 | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |