Gainesville, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 11.3 °C (low) to 23.7 °C (high). Annual precipitation averages 1000.3 Millimeters. Gainesville 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 | -0.4 °C | 12 °C | 50.8 mm |
| February | 1.7 °C | 14.4 °C | 65.53 mm |
| March | 6 °C | 18.8 °C | 87.63 mm |
| April | 10.4 °C | 23.3 °C | 88.39 mm |
| May | 15.9 °C | 27.3 °C | 129.29 mm |
| June | 20.7 °C | 32.1 °C | 103.38 mm |
| July | 22.9 °C | 34.8 °C | 69.34 mm |
| August | 22.4 °C | 35.1 °C | 65.53 mm |
| September | 18.2 °C | 30.8 °C | 92.71 mm |
| October | 11.7 °C | 24.9 °C | 109.98 mm |
| November | 5.7 °C | 18.3 °C | 66.8 mm |
| December | 0.9 °C | 13.1 °C | 70.87 mm |
| Annual | 11.3 °C | 23.7 °C | 1000.25 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 | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |