Tenaha, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 12.6 °C (low) to 25 °C (high). Annual precipitation averages 1362.5 Millimeters. Tenaha is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 11 - Mar. 20 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 2.3 °C | 14.6 °C | 124.46 mm |
| February | 4.3 °C | 16.9 °C | 113.54 mm |
| March | 8 °C | 20.9 °C | 129.54 mm |
| April | 11.9 °C | 24.8 °C | 122.94 mm |
| May | 17.1 °C | 28.7 °C | 114.3 mm |
| June | 21.1 °C | 32.2 °C | 118.62 mm |
| July | 22.7 °C | 34.1 °C | 84.84 mm |
| August | 22.3 °C | 34.6 °C | 89.92 mm |
| September | 18.7 °C | 31.4 °C | 92.2 mm |
| October | 12.6 °C | 26.3 °C | 119.89 mm |
| November | 7.2 °C | 19.9 °C | 114.81 mm |
| December | 3.4 °C | 15.5 °C | 137.41 mm |
| Annual | 12.6 °C | 25 °C | 1362.47 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| Average Days With Frost | 40-50 Days |
| Plant Hardiness Zone | Zone 8b : -9.4°C to -6.7°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 |