Goldthwaite, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 53.7 °F (low) to 76.7 °F (high). Annual precipitation averages 30.1 Inches. 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 | 34.7 °F | 58.6 °F | 1.77 in. |
| February | 38.6 °F | 62.2 °F | 2.17 in. |
| March | 45.9 °F | 69.0 °F | 2.59 in. |
| April | 52.5 °F | 77.0 °F | 2.2 in. |
| May | 61.1 °F | 83.2 °F | 4.23 in. |
| June | 68.6 °F | 89.6 °F | 3.92 in. |
| July | 71.2 °F | 93.6 °F | 1.72 in. |
| August | 71.2 °F | 93.9 °F | 1.85 in. |
| September | 65.1 °F | 87.4 °F | 2.58 in. |
| October | 54.8 °F | 78.5 °F | 3.3 in. |
| November | 44.4 °F | 67.5 °F | 2.07 in. |
| December | 36.1 °F | 59.5 °F | 1.69 in. |
| Annual | 53.7 °F | 76.7 °F | 30.09 in. |
| 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 : 15°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 8a : 10°F to 15°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |