Mexia, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 12.9 °C (low) to 25.3 °C (high). Annual precipitation averages 1038.9 Millimeters. Mexia 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 | 2.4 °C | 14.6 °C | 73.66 mm |
| February | 4.7 °C | 16.9 °C | 76.96 mm |
| March | 8.3 °C | 20.6 °C | 98.3 mm |
| April | 12.3 °C | 24.8 °C | 88.65 mm |
| May | 17.2 °C | 28.6 °C | 111 mm |
| June | 21.4 °C | 32.8 °C | 100.08 mm |
| July | 22.8 °C | 35 °C | 47.24 mm |
| August | 22.6 °C | 35.7 °C | 65.79 mm |
| September | 19.1 °C | 32.2 °C | 83.31 mm |
| October | 13.2 °C | 26.5 °C | 112.27 mm |
| November | 7.8 °C | 20.3 °C | 87.12 mm |
| December | 3.4 °C | 15.5 °C | 94.49 mm |
| Annual | 12.9 °C | 25.3 °C | 1038.87 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 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |