Waelder, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 14 °C (low) to 26.6 °C (high). Annual precipitation averages 935.2 Millimeters. Waelder 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 | 4.1 °C | 16.9 °C | 64.52 mm |
| February | 6.3 °C | 18.9 °C | 52.58 mm |
| March | 10 °C | 22.7 °C | 71.12 mm |
| April | 13.7 °C | 26.4 °C | 69.09 mm |
| May | 18.4 °C | 29.9 °C | 113.54 mm |
| June | 21.8 °C | 33.2 °C | 95 mm |
| July | 22.6 °C | 35.1 °C | 51.05 mm |
| August | 22.7 °C | 35.7 °C | 75.95 mm |
| September | 19.7 °C | 32.6 °C | 78.49 mm |
| October | 14.4 °C | 28.1 °C | 116.33 mm |
| November | 8.9 °C | 22.1 °C | 78.99 mm |
| December | 4.9 °C | 17.9 °C | 68.58 mm |
| Annual | 14 °C | 26.6 °C | 935.24 mm |
| Average First Frost Date | Dec. 21 - Dec. 31 |
| Average Last Frost Date | Feb. 1 - Feb. 10 |
| Average Days With Frost | 10-20 Days |
| 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 | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |