Allison, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 7.5 °C (low) to 22.2 °C (high). Annual precipitation averages 602 Millimeters. Allison is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -4.3 °C | 10.2 °C | 17.27 mm |
| February | -2.8 °C | 12.1 °C | 22.35 mm |
| March | 1.8 °C | 17.4 °C | 40.39 mm |
| April | 6.3 °C | 22.1 °C | 56.13 mm |
| May | 12.1 °C | 26.7 °C | 90.42 mm |
| June | 17.4 °C | 31.2 °C | 81.79 mm |
| July | 19.8 °C | 33.9 °C | 70.36 mm |
| August | 19 °C | 33.4 °C | 72.14 mm |
| September | 14.9 °C | 29 °C | 57.91 mm |
| October | 7.7 °C | 23.1 °C | 44.7 mm |
| November | 1.2 °C | 16.2 °C | 27.94 mm |
| December | -3.3 °C | 10.7 °C | 20.57 mm |
| Annual | 7.5 °C | 22.2 °C | 601.97 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |