Oak Grove, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 54.3 °F (low) to 76.4 °F (high). Annual precipitation averages 41.1 Inches. Oak Grove is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 1 - Mar. 10 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 34.6 °F | 56.3 °F | 3.11 in. |
| February | 38.5 °F | 60.5 °F | 3.1 in. |
| March | 45.6 °F | 67.7 °F | 3.78 in. |
| April | 52.7 °F | 75.2 °F | 3.41 in. |
| May | 62.6 °F | 82.6 °F | 4.59 in. |
| June | 70.2 °F | 90.6 °F | 3.72 in. |
| July | 73.1 °F | 94.8 °F | 1.98 in. |
| August | 72.6 °F | 95.7 °F | 2.58 in. |
| September | 66.0 °F | 89.2 °F | 2.85 in. |
| October | 54.5 °F | 78.9 °F | 4.95 in. |
| November | 44.4 °F | 67.1 °F | 3.29 in. |
| December | 36.6 °F | 58.3 °F | 3.73 in. |
| Annual | 54.3 °F | 76.4 °F | 41.09 in. |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 1 - Mar. 10 |
| Average Days With Frost | 30-40 Days |
| Plant Hardiness Zone | Zone 8b : 15°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 8a : 10°F to 15°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |