Kirbyville, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 55.5 °F (low) to 78.8 °F (high). Annual precipitation averages 61.6 Inches. Kirbyville is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Feb. 21 - Feb. 29 through the first frost around Nov. 21 - Nov. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 38.6 °F | 61.7 °F | 5.42 in. |
| February | 42.3 °F | 65.5 °F | 4.37 in. |
| March | 48.4 °F | 72.2 °F | 4.81 in. |
| April | 55.1 °F | 78.5 °F | 4.71 in. |
| May | 62.7 °F | 85.3 °F | 4.94 in. |
| June | 69.1 °F | 90.8 °F | 5.89 in. |
| July | 70.9 °F | 93.3 °F | 5.24 in. |
| August | 70.8 °F | 94.0 °F | 4.89 in. |
| September | 66.0 °F | 89.7 °F | 5.3 in. |
| October | 55.3 °F | 81.6 °F | 5.23 in. |
| November | 46.2 °F | 70.5 °F | 5.27 in. |
| December | 40.4 °F | 62.9 °F | 5.55 in. |
| Annual | 55.5 °F | 78.8 °F | 61.62 in. |
| Average First Frost Date | Nov. 21 - Nov. 30 |
| Average Last Frost Date | Feb. 21 - Feb. 29 |
| Average Days With Frost | 10-20 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 |