Carlsbad, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 10.5 °C (low) to 25.8 °C (high). Annual precipitation averages 515.1 Millimeters. Carlsbad is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -0.7 °C | 15 °C | 22.35 mm |
| February | 1.3 °C | 17.4 °C | 29.97 mm |
| March | 5.6 °C | 21.7 °C | 38.35 mm |
| April | 9.6 °C | 26.6 °C | 35.56 mm |
| May | 15.6 °C | 30.7 °C | 57.91 mm |
| June | 20.1 °C | 34.1 °C | 60.2 mm |
| July | 21.4 °C | 35.4 °C | 40.13 mm |
| August | 20.9 °C | 35.1 °C | 58.17 mm |
| September | 16.9 °C | 31.1 °C | 64.01 mm |
| October | 10.9 °C | 26.3 °C | 55.37 mm |
| November | 4.6 °C | 20 °C | 31.24 mm |
| December | 0.1 °C | 15.7 °C | 21.84 mm |
| Annual | 10.5 °C | 25.8 °C | 515.1 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8a : -12.2°C to -9.4°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 |