Preston, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 11 °C (low) to 23.2 °C (high). Annual precipitation averages 1067.8 Millimeters. Preston is located in USDA Plant Hardiness Zone 8a. 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 | -0.6 °C | 11.6 °C | 58.42 mm |
| February | 1.4 °C | 13.9 °C | 62.23 mm |
| March | 5.8 °C | 18.3 °C | 89.41 mm |
| April | 10.2 °C | 22.8 °C | 96.77 mm |
| May | 15.6 °C | 26.7 °C | 144.27 mm |
| June | 20.3 °C | 31.4 °C | 112.78 mm |
| July | 22.6 °C | 34.2 °C | 75.95 mm |
| August | 21.8 °C | 34.3 °C | 69.34 mm |
| September | 17.5 °C | 30.3 °C | 94.49 mm |
| October | 11.2 °C | 24.6 °C | 105.41 mm |
| November | 5.7 °C | 18.1 °C | 78.49 mm |
| December | 0.8 °C | 12.6 °C | 80.26 mm |
| Annual | 11 °C | 23.2 °C | 1067.82 mm |
| 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 8a : -12.2°C to -9.4°C |
| Plant Hardiness Zone - 2012 | Zone 7b : -15°C to -12.2°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |