Spring Branch, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 55.9 °F (low) to 79 °F (high). Annual precipitation averages 35.2 Inches. Spring Branch is located in USDA Plant Hardiness Zone 9a. 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 | 37.9 °F | 61.4 °F | 2.28 in. |
| February | 41.7 °F | 65.3 °F | 1.95 in. |
| March | 48.4 °F | 71.9 °F | 2.73 in. |
| April | 55.0 °F | 79.1 °F | 2.49 in. |
| May | 63.9 °F | 85.3 °F | 4.5 in. |
| June | 70.1 °F | 91.4 °F | 3.44 in. |
| July | 72.0 °F | 94.3 °F | 2.15 in. |
| August | 71.8 °F | 95.7 °F | 2.41 in. |
| September | 66.5 °F | 89.7 °F | 3.84 in. |
| October | 56.9 °F | 81.3 °F | 4.33 in. |
| November | 46.9 °F | 70.1 °F | 2.84 in. |
| December | 39.6 °F | 62.8 °F | 2.25 in. |
| Annual | 55.9 °F | 79 °F | 35.21 in. |
| 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 9a : 20°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 8b : 15°F to 20°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |