Frankston, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 55.5 °F (low) to 77.4 °F (high). Annual precipitation averages 45.9 Inches. Frankston 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 | 37.3 °F | 58.4 °F | 3.73 in. |
| February | 40.4 °F | 62.3 °F | 3.79 in. |
| March | 47.3 °F | 69.7 °F | 3.96 in. |
| April | 53.6 °F | 76.9 °F | 3.79 in. |
| May | 63.3 °F | 84.0 °F | 4.46 in. |
| June | 70.4 °F | 90.3 °F | 4.39 in. |
| July | 73.3 °F | 94.0 °F | 2.33 in. |
| August | 72.8 °F | 95.2 °F | 2.75 in. |
| September | 66.7 °F | 89.4 °F | 3.66 in. |
| October | 55.9 °F | 79.8 °F | 4.61 in. |
| November | 45.7 °F | 68.3 °F | 4.04 in. |
| December | 38.8 °F | 60.1 °F | 4.36 in. |
| Annual | 55.5 °F | 77.4 °F | 45.87 in. |
| 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 : 15°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 8b : 15°F to 20°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |