San Leanna, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 13.7 °C (low) to 26.2 °C (high). Annual precipitation averages 962.7 Millimeters. San Leanna is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Feb. 21 - Feb. 29 through the first frost around Nov. 21 - Nov. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 3.5 °C | 16.4 °C | 68.33 mm |
| February | 5.6 °C | 18.3 °C | 53.09 mm |
| March | 9.4 °C | 22.1 °C | 77.22 mm |
| April | 13.2 °C | 25.8 °C | 66.55 mm |
| May | 18.1 °C | 29.6 °C | 130.3 mm |
| June | 21.7 °C | 33.1 °C | 90.93 mm |
| July | 22.8 °C | 34.9 °C | 60.96 mm |
| August | 22.7 °C | 35.7 °C | 64.01 mm |
| September | 19.7 °C | 32.3 °C | 92.2 mm |
| October | 14.2 °C | 27.4 °C | 109.73 mm |
| November | 8.6 °C | 21.4 °C | 73.91 mm |
| December | 4.3 °C | 17.1 °C | 75.44 mm |
| Annual | 13.7 °C | 26.2 °C | 962.67 mm |
| Average First Frost Date | Nov. 21 - Nov. 30 |
| Average Last Frost Date | Feb. 21 - Feb. 29 |
| 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 |