Welch, Texas has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 8.3 °C (low) to 24.1 °C (high). Annual precipitation averages 439.4 Millimeters. Welch 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 | -2.7 °C | 13.1 °C | 16.76 mm |
| February | -1.1 °C | 15.6 °C | 16.76 mm |
| March | 2.9 °C | 20.2 °C | 26.42 mm |
| April | 7.2 °C | 24.7 °C | 26.16 mm |
| May | 13 °C | 29.1 °C | 58.17 mm |
| June | 17.9 °C | 33.1 °C | 58.93 mm |
| July | 19.5 °C | 34.2 °C | 48.77 mm |
| August | 18.9 °C | 33.5 °C | 44.7 mm |
| September | 15.1 °C | 29.4 °C | 65.28 mm |
| October | 8.7 °C | 24.9 °C | 37.08 mm |
| November | 1.9 °C | 18.1 °C | 22.35 mm |
| December | -1.9 °C | 13.5 °C | 18.03 mm |
| Annual | 8.3 °C | 24.1 °C | 439.41 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 8a : -12.2°C to -9.4°C |
| Plant Hardiness Zone - 2012 | Zone 7b : -15°C to -12.2°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |