Alma, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 12.6 °C (low) to 25 °C (high). Annual precipitation averages 1043.7 Millimeters. Alma is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 1 - Mar. 10 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 1.7 °C | 13.9 °C | 78.99 mm |
| February | 3.8 °C | 16.3 °C | 77.47 mm |
| March | 7.8 °C | 20.2 °C | 93.73 mm |
| April | 11.8 °C | 24.3 °C | 93.22 mm |
| May | 17.1 °C | 28.4 °C | 113.03 mm |
| June | 21.4 °C | 32.8 °C | 101.09 mm |
| July | 23 °C | 35.1 °C | 45.72 mm |
| August | 22.8 °C | 35.6 °C | 67.56 mm |
| September | 18.9 °C | 32.1 °C | 81.03 mm |
| October | 12.8 °C | 26.4 °C | 123.7 mm |
| November | 7.1 °C | 19.8 °C | 79.76 mm |
| December | 2.7 °C | 15 °C | 88.39 mm |
| Annual | 12.6 °C | 25 °C | 1043.69 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 1 - Mar. 10 |
| Average Days With Frost | 30-40 Days |
| Plant Hardiness Zone | Zone 8b : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |