Wortham, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 13 °C (low) to 25.5 °C (high). Annual precipitation averages 1050.3 Millimeters. Wortham 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 | 2.5 °C | 14.7 °C | 76.71 mm |
| February | 4.6 °C | 17.1 °C | 79.25 mm |
| March | 8.4 °C | 20.8 °C | 97.54 mm |
| April | 12.3 °C | 25.1 °C | 90.42 mm |
| May | 17.4 °C | 28.8 °C | 112.01 mm |
| June | 21.5 °C | 32.9 °C | 100.33 mm |
| July | 22.9 °C | 35.1 °C | 48.77 mm |
| August | 22.6 °C | 35.8 °C | 65.02 mm |
| September | 19.1 °C | 32.3 °C | 83.31 mm |
| October | 13.3 °C | 26.7 °C | 116.84 mm |
| November | 7.7 °C | 20.4 °C | 86.11 mm |
| December | 3.5 °C | 15.7 °C | 93.98 mm |
| Annual | 13 °C | 25.5 °C | 1050.29 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 | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |