Sylvester, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 51.2 °F (low) to 77.1 °F (high). Annual precipitation averages 24 Inches. Sylvester is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 30.7 °F | 56.8 °F | 1.05 in. |
| February | 34.1 °F | 61.0 °F | 1.25 in. |
| March | 41.6 °F | 69.4 °F | 1.71 in. |
| April | 49.6 °F | 78.3 °F | 1.76 in. |
| May | 59.8 °F | 85.5 °F | 3.15 in. |
| June | 68.2 °F | 92.4 °F | 3.22 in. |
| July | 71.7 °F | 96.1 °F | 1.76 in. |
| August | 70.8 °F | 95.5 °F | 2.35 in. |
| September | 63.2 °F | 87.7 °F | 2.94 in. |
| October | 52.1 °F | 78.5 °F | 2.17 in. |
| November | 40.5 °F | 66.4 °F | 1.37 in. |
| December | 32.6 °F | 57.9 °F | 1.23 in. |
| Annual | 51.2 °F | 77.1 °F | 23.96 in. |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 50-75 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 | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |