Impact, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 11.2 °C (low) to 24.9 °C (high). Annual precipitation averages 661.4 Millimeters. Impact 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. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -0.2 °C | 13.9 °C | 26.16 mm |
| February | 1.8 °C | 16.2 °C | 38.35 mm |
| March | 6.1 °C | 20.7 °C | 51.31 mm |
| April | 10.3 °C | 25.2 °C | 48.26 mm |
| May | 15.9 °C | 29.3 °C | 83.57 mm |
| June | 20.4 °C | 33 °C | 86.11 mm |
| July | 22.3 °C | 35.2 °C | 49.78 mm |
| August | 21.9 °C | 35.1 °C | 62.23 mm |
| September | 17.7 °C | 30.9 °C | 75.95 mm |
| October | 11.7 °C | 25.8 °C | 66.8 mm |
| November | 5.4 °C | 19.2 °C | 40.13 mm |
| December | 0.9 °C | 14.6 °C | 32.77 mm |
| Annual | 11.2 °C | 24.9 °C | 661.42 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 40-50 Days |
| Plant Hardiness Zone | Zone 8a : -12.2°C to -9.4°C |
| Plant Hardiness Zone - 2012 | Zone 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |