Oklaunion, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 10.1 °C (low) to 24.4 °C (high). Annual precipitation averages 716.8 Millimeters. Oklaunion is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -2 °C | 12.3 °C | 29.21 mm |
| February | -0.2 °C | 14.5 °C | 34.04 mm |
| March | 4.4 °C | 19.4 °C | 53.85 mm |
| April | 8.8 °C | 24.2 °C | 65.53 mm |
| May | 15 °C | 29 °C | 103.89 mm |
| June | 20.3 °C | 33.7 °C | 88.9 mm |
| July | 22.3 °C | 36.2 °C | 59.94 mm |
| August | 21.8 °C | 36 °C | 60.45 mm |
| September | 17.4 °C | 31.4 °C | 72.39 mm |
| October | 10.7 °C | 25.4 °C | 69.6 mm |
| November | 4.1 °C | 18.4 °C | 42.67 mm |
| December | -1 °C | 12.8 °C | 36.32 mm |
| Annual | 10.1 °C | 24.4 °C | 716.79 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8a : -12.2°C to -9.4°C |
| Plant Hardiness Zone - 2012 | Zone 7b : -15°C to -12.2°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |