Caldwell, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 57 °F (low) to 78.8 °F (high). Annual precipitation averages 39.8 Inches. Caldwell is located in USDA Plant Hardiness Zone 9a. 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 | 39.0 °F | 60.6 °F | 3.38 in. |
| February | 42.7 °F | 64.2 °F | 2.65 in. |
| March | 49.0 °F | 71.3 °F | 3.7 in. |
| April | 56.0 °F | 78.1 °F | 2.54 in. |
| May | 64.9 °F | 85.0 °F | 4.83 in. |
| June | 71.5 °F | 91.5 °F | 3.24 in. |
| July | 73.6 °F | 94.5 °F | 1.67 in. |
| August | 73.1 °F | 95.7 °F | 2.51 in. |
| September | 67.8 °F | 90.3 °F | 3.2 in. |
| October | 57.7 °F | 81.2 °F | 4.8 in. |
| November | 47.7 °F | 70.6 °F | 3.5 in. |
| December | 40.6 °F | 62.5 °F | 3.77 in. |
| Annual | 57 °F | 78.8 °F | 39.79 in. |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 1 - Mar. 10 |
| Average Days With Frost | 20-30 Days |
| Plant Hardiness Zone | Zone 9a : 20°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 8b : 15°F to 20°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |