Southmayd, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 52.6 °F (low) to 74.3 °F (high). Annual precipitation averages 41.7 Inches. Southmayd is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Mar. 11 - Mar. 20 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 31.7 °F | 53.2 °F | 2.28 in. |
| February | 35.3 °F | 57.7 °F | 2.65 in. |
| March | 42.9 °F | 65.4 °F | 3.75 in. |
| April | 51.0 °F | 73.4 °F | 3.62 in. |
| May | 60.6 °F | 80.7 °F | 5.31 in. |
| June | 69.2 °F | 89.2 °F | 4.21 in. |
| July | 73.3 °F | 94.2 °F | 2.74 in. |
| August | 72.3 °F | 94.5 °F | 2.71 in. |
| September | 64.8 °F | 87.1 °F | 3.59 in. |
| October | 53.4 °F | 76.6 °F | 4.44 in. |
| November | 42.7 °F | 64.8 °F | 3.19 in. |
| December | 34.1 °F | 55.1 °F | 3.23 in. |
| Annual | 52.6 °F | 74.3 °F | 41.72 in. |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| Average Days With Frost | 40-50 Days |
| Plant Hardiness Zone | Zone 8a : 10°F to 15°F |
| Plant Hardiness Zone - 2012 | Zone 8a : 10°F to 15°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |