Jourdanton, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 14.8 °C (low) to 28.2 °C (high). Annual precipitation averages 723.6 Millimeters. Jourdanton is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Feb. 11 - Feb. 20 through the first frost around Dec. 1 - Dec. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 4.7 °C | 18.7 °C | 38.86 mm |
| February | 7.1 °C | 21.2 °C | 42.93 mm |
| March | 10.9 °C | 24.6 °C | 58.17 mm |
| April | 14.4 °C | 28.3 °C | 51.05 mm |
| May | 19.2 °C | 31.8 °C | 85.09 mm |
| June | 22.3 °C | 34.8 °C | 75.69 mm |
| July | 23.2 °C | 36.2 °C | 54.86 mm |
| August | 23.2 °C | 36.9 °C | 57.91 mm |
| September | 20.7 °C | 33.7 °C | 90.93 mm |
| October | 15.5 °C | 29.6 °C | 69.09 mm |
| November | 10.1 °C | 23.7 °C | 51.05 mm |
| December | 5.8 °C | 19.4 °C | 48.01 mm |
| Annual | 14.8 °C | 28.2 °C | 723.64 mm |
| Average First Frost Date | Dec. 1 - Dec. 10 |
| Average Last Frost Date | Feb. 11 - Feb. 20 |
| Average Days With Frost | 10-20 Days |
| Plant Hardiness Zone | Zone 9a : -6.7°C to -3.9°C |
| Plant Hardiness Zone - 2012 | Zone 9a : -6.7°C to -3.9°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |