Fort Clark Springs, Texas has a Hot Semi-Arid Climate climate (Köppen classification: BSh). Average annual temperatures range from 14.4 °C (low) to 27.5 °C (high). Annual precipitation averages 542.6 Millimeters. Fort Clark Springs is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Feb. 1 - Feb. 10 through the first frost around Dec. 21 - Dec. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 3.9 °C | 17.7 °C | 23.11 mm |
| February | 6.2 °C | 20.3 °C | 25.4 mm |
| March | 10.5 °C | 24.5 °C | 42.93 mm |
| April | 14.2 °C | 28.4 °C | 36.07 mm |
| May | 19 °C | 31.6 °C | 73.41 mm |
| June | 22.3 °C | 34.3 °C | 74.17 mm |
| July | 23.2 °C | 35.7 °C | 50.55 mm |
| August | 23.4 °C | 36.1 °C | 43.43 mm |
| September | 20.4 °C | 32.7 °C | 71.63 mm |
| October | 15.3 °C | 28.6 °C | 46.74 mm |
| November | 9.3 °C | 22.2 °C | 33.27 mm |
| December | 4.6 °C | 18.1 °C | 21.84 mm |
| Annual | 14.4 °C | 27.5 °C | 542.55 mm |
| Average First Frost Date | Dec. 21 - Dec. 31 |
| Average Last Frost Date | Feb. 1 - Feb. 10 |
| Average Days With Frost | Frost Rare |
| Plant Hardiness Zone | Zone 9a : -6.7°C to -3.9°C |
| Plant Hardiness Zone - 2012 | Zone 8b : -9.4°C to -6.7°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | BSh - Hot Semi-Arid Climate |