Carlton, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 11.6 °C (low) to 24.7 °C (high). Annual precipitation averages 871.2 Millimeters. Carlton is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 11 - Mar. 20 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 0.8 °C | 14.2 °C | 52.07 mm |
| February | 2.8 °C | 16.3 °C | 58.93 mm |
| March | 6.8 °C | 20.3 °C | 75.95 mm |
| April | 10.9 °C | 24.7 °C | 71.12 mm |
| May | 16.1 °C | 28.4 °C | 112.78 mm |
| June | 20.2 °C | 32.3 °C | 105.92 mm |
| July | 21.9 °C | 34.6 °C | 49.02 mm |
| August | 21.7 °C | 34.9 °C | 60.2 mm |
| September | 17.9 °C | 30.9 °C | 78.23 mm |
| October | 12.1 °C | 25.7 °C | 93.47 mm |
| November | 6.3 °C | 19.4 °C | 59.94 mm |
| December | 1.8 °C | 14.9 °C | 53.59 mm |
| Annual | 11.6 °C | 24.7 °C | 871.22 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| Average Days With Frost | 40-50 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 |