Buna, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 13.7 °C (low) to 26.1 °C (high). Annual precipitation averages 1565.4 Millimeters. Buna is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Feb. 11 - Feb. 20 through the first frost around Nov. 21 - Nov. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 4.3 °C | 16.4 °C | 136.4 mm |
| February | 6.4 °C | 18.7 °C | 106.17 mm |
| March | 9.8 °C | 22.3 °C | 108.97 mm |
| April | 13.5 °C | 25.9 °C | 113.79 mm |
| May | 17.8 °C | 29.7 °C | 125.73 mm |
| June | 21.3 °C | 32.8 °C | 157.48 mm |
| July | 22.3 °C | 34 °C | 133.6 mm |
| August | 22.1 °C | 34.4 °C | 134.37 mm |
| September | 19.5 °C | 32.1 °C | 140.46 mm |
| October | 13.8 °C | 27.6 °C | 140.46 mm |
| November | 8.6 °C | 21.6 °C | 128.52 mm |
| December | 5.4 °C | 17.4 °C | 139.45 mm |
| Annual | 13.7 °C | 26.1 °C | 1565.4 mm |
| Average First Frost Date | Nov. 21 - Nov. 30 |
| Average Last Frost Date | Feb. 11 - Feb. 20 |
| 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 |