Kirbyville, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 13.1 °C (low) to 26 °C (high). Annual precipitation averages 1565.2 Millimeters. 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 | 3.7 °C | 16.5 °C | 137.67 mm |
| February | 5.7 °C | 18.6 °C | 111 mm |
| March | 9.1 °C | 22.3 °C | 122.17 mm |
| April | 12.8 °C | 25.8 °C | 119.63 mm |
| May | 17.1 °C | 29.6 °C | 125.48 mm |
| June | 20.6 °C | 32.7 °C | 149.61 mm |
| July | 21.6 °C | 34.1 °C | 133.1 mm |
| August | 21.6 °C | 34.4 °C | 124.21 mm |
| September | 18.9 °C | 32.1 °C | 134.62 mm |
| October | 12.9 °C | 27.6 °C | 132.84 mm |
| November | 7.9 °C | 21.4 °C | 133.86 mm |
| December | 4.7 °C | 17.2 °C | 140.97 mm |
| Annual | 13.1 °C | 26 °C | 1565.16 mm |
| 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 : -6.7°C to -3.9°C |
| Plant Hardiness Zone - 2012 | Zone 8b : -9.4°C to -6.7°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |