Oak Grove, Kentucky has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.6 °C (low) to 20.4 °C (high). Annual precipitation averages 1358.6 Millimeters. Oak Grove is located in USDA Plant Hardiness Zone 7a. 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 | -2.9 °C | 7.2 °C | 105.41 mm |
| February | -1.4 °C | 9.9 °C | 116.08 mm |
| March | 2.8 °C | 15.1 °C | 127.76 mm |
| April | 8.1 °C | 20.9 °C | 133.1 mm |
| May | 13.7 °C | 25.4 °C | 141.73 mm |
| June | 18.3 °C | 29.6 °C | 104.14 mm |
| July | 20.3 °C | 31.4 °C | 119.63 mm |
| August | 19.2 °C | 31.3 °C | 85.09 mm |
| September | 15 °C | 28.1 °C | 90.42 mm |
| October | 8.6 °C | 22 °C | 101.85 mm |
| November | 2.6 °C | 14.9 °C | 103.12 mm |
| December | -0.9 °C | 9.3 °C | 130.3 mm |
| Annual | 8.6 °C | 20.4 °C | 1358.63 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 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |