Goldthwaite, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 12.1 °C (low) to 24.8 °C (high). Annual precipitation averages 764.3 Millimeters. Goldthwaite is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 1.5 °C | 14.8 °C | 44.96 mm |
| February | 3.7 °C | 16.8 °C | 55.12 mm |
| March | 7.7 °C | 20.6 °C | 65.79 mm |
| April | 11.4 °C | 25 °C | 55.88 mm |
| May | 16.2 °C | 28.4 °C | 107.44 mm |
| June | 20.3 °C | 32 °C | 99.57 mm |
| July | 21.8 °C | 34.2 °C | 43.69 mm |
| August | 21.8 °C | 34.4 °C | 46.99 mm |
| September | 18.4 °C | 30.8 °C | 65.53 mm |
| October | 12.7 °C | 25.8 °C | 83.82 mm |
| November | 6.9 °C | 19.7 °C | 52.58 mm |
| December | 2.3 °C | 15.3 °C | 42.93 mm |
| Annual | 12.1 °C | 24.8 °C | 764.3 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| 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 |