Frankston, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 13 °C (low) to 25.2 °C (high). Annual precipitation averages 1165.1 Millimeters. 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 | 2.9 °C | 14.7 °C | 94.74 mm |
| February | 4.7 °C | 16.8 °C | 96.27 mm |
| March | 8.5 °C | 20.9 °C | 100.58 mm |
| April | 12 °C | 24.9 °C | 96.27 mm |
| May | 17.4 °C | 28.9 °C | 113.28 mm |
| June | 21.3 °C | 32.4 °C | 111.51 mm |
| July | 22.9 °C | 34.4 °C | 59.18 mm |
| August | 22.7 °C | 35.1 °C | 69.85 mm |
| September | 19.3 °C | 31.9 °C | 92.96 mm |
| October | 13.3 °C | 26.6 °C | 117.09 mm |
| November | 7.6 °C | 20.2 °C | 102.62 mm |
| December | 3.8 °C | 15.6 °C | 110.74 mm |
| Annual | 13 °C | 25.2 °C | 1165.09 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 |