Overton, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 12.6 °C (low) to 24.8 °C (high). Annual precipitation averages 1210.3 Millimeters. Overton 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 | 2.2 °C | 14 °C | 100.08 mm |
| February | 4.2 °C | 16.3 °C | 103.63 mm |
| March | 8 °C | 20.7 °C | 109.98 mm |
| April | 11.9 °C | 24.8 °C | 105.41 mm |
| May | 17.1 °C | 28.6 °C | 115.06 mm |
| June | 21.1 °C | 32.2 °C | 119.89 mm |
| July | 22.7 °C | 34.2 °C | 66.29 mm |
| August | 22.3 °C | 34.5 °C | 70.36 mm |
| September | 18.8 °C | 31.4 °C | 89.92 mm |
| October | 12.7 °C | 25.9 °C | 110.24 mm |
| November | 7.2 °C | 19.6 °C | 103.89 mm |
| December | 3.2 °C | 14.9 °C | 115.57 mm |
| Annual | 12.6 °C | 24.8 °C | 1210.32 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 | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |