Oak Grove, Alabama has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 50.7 °F (low) to 74.6 °F (high). Annual precipitation averages 56.6 Inches. Oak Grove is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 32.8 °F | 55.4 °F | 5.28 in. |
| February | 35.7 °F | 59.9 °F | 5.65 in. |
| March | 41.9 °F | 67.7 °F | 5.34 in. |
| April | 48.6 °F | 75.2 °F | 4.98 in. |
| May | 57.9 °F | 82.1 °F | 4.37 in. |
| June | 65.9 °F | 87.9 °F | 4.92 in. |
| July | 69.2 °F | 90.9 °F | 4.66 in. |
| August | 68.3 °F | 90.2 °F | 4.36 in. |
| September | 62.7 °F | 85.9 °F | 3.79 in. |
| October | 50.4 °F | 76.6 °F | 3.27 in. |
| November | 39.7 °F | 65.9 °F | 4.71 in. |
| December | 35.4 °F | 57.8 °F | 5.31 in. |
| Annual | 50.7 °F | 74.6 °F | 56.64 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8a : 10°F to 15°F |
| Plant Hardiness Zone - 2012 | Zone 8a : 10°F to 15°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |