Silsbee, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 13.9 °C (low) to 26.1 °C (high). Annual precipitation averages 1559.3 Millimeters. 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 | 4.4 °C | 16.5 °C | 127.25 mm |
| February | 6.6 °C | 18.8 °C | 103.38 mm |
| March | 10 °C | 22.4 °C | 101.09 mm |
| April | 13.7 °C | 26 °C | 107.19 mm |
| May | 18.1 °C | 29.6 °C | 121.16 mm |
| June | 21.4 °C | 32.7 °C | 160.53 mm |
| July | 22.4 °C | 34 °C | 133.1 mm |
| August | 22.3 °C | 34.3 °C | 138.43 mm |
| September | 19.7 °C | 31.9 °C | 143.76 mm |
| October | 13.9 °C | 27.6 °C | 155.19 mm |
| November | 8.8 °C | 21.6 °C | 128.52 mm |
| December | 5.6 °C | 17.5 °C | 139.7 mm |
| Annual | 13.9 °C | 26.1 °C | 1559.3 mm |
| 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 : -6.7°C to -3.9°C |
| Plant Hardiness Zone - 2012 | Zone 9a : -6.7°C to -3.9°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |