Silsbee, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 57.1 °F (low) to 78.9 °F (high). Annual precipitation averages 61.4 Inches. Silsbee is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Feb. 1 - Feb. 10 through the first frost around Dec. 11 - Dec. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 40.0 °F | 61.7 °F | 5.01 in. |
| February | 43.9 °F | 65.8 °F | 4.07 in. |
| March | 50.0 °F | 72.3 °F | 3.98 in. |
| April | 56.6 °F | 78.8 °F | 4.22 in. |
| May | 64.6 °F | 85.3 °F | 4.77 in. |
| June | 70.6 °F | 90.8 °F | 6.32 in. |
| July | 72.4 °F | 93.2 °F | 5.24 in. |
| August | 72.1 °F | 93.7 °F | 5.45 in. |
| September | 67.4 °F | 89.4 °F | 5.66 in. |
| October | 57.0 °F | 81.6 °F | 6.11 in. |
| November | 47.9 °F | 70.9 °F | 5.06 in. |
| December | 42.1 °F | 63.5 °F | 5.5 in. |
| Annual | 57.1 °F | 78.9 °F | 61.39 in. |
| Average First Frost Date | Dec. 11 - Dec. 20 |
| Average Last Frost Date | Feb. 1 - Feb. 10 |
| Average Days With Frost | Frost Rare |
| Plant Hardiness Zone | Zone 9a : 20°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 9a : 20°F to 25°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |