Oak Grove, Alabama has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 10.4 °C (low) to 23.7 °C (high). Annual precipitation averages 1438.7 Millimeters. 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 | 0.4 °C | 13 °C | 134.11 mm |
| February | 2.1 °C | 15.5 °C | 143.51 mm |
| March | 5.5 °C | 19.8 °C | 135.64 mm |
| April | 9.2 °C | 24 °C | 126.49 mm |
| May | 14.4 °C | 27.8 °C | 111 mm |
| June | 18.8 °C | 31.1 °C | 124.97 mm |
| July | 20.7 °C | 32.7 °C | 118.36 mm |
| August | 20.2 °C | 32.3 °C | 110.74 mm |
| September | 17.1 °C | 29.9 °C | 96.27 mm |
| October | 10.2 °C | 24.8 °C | 83.06 mm |
| November | 4.3 °C | 18.8 °C | 119.63 mm |
| December | 1.9 °C | 14.3 °C | 134.87 mm |
| Annual | 10.4 °C | 23.7 °C | 1438.65 mm |
| 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 : -12.2°C to -9.4°C |
| Plant Hardiness Zone - 2012 | Zone 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |