Oak Grove, Missouri has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6.5 °C (low) to 18.2 °C (high). Annual precipitation averages 1091.4 Millimeters. Oak Grove is located in USDA Plant Hardiness Zone 6b. 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 | -7.2 °C | 3.4 °C | 35.56 mm |
| February | -4.9 °C | 6.3 °C | 45.47 mm |
| March | 0.3 °C | 12.5 °C | 68.58 mm |
| April | 6.1 °C | 18.4 °C | 107.19 mm |
| May | 12.1 °C | 23.7 °C | 142.49 mm |
| June | 17.4 °C | 28.7 °C | 141.73 mm |
| July | 19.7 °C | 31.1 °C | 127.76 mm |
| August | 18.4 °C | 30.4 °C | 115.32 mm |
| September | 13.6 °C | 26.2 °C | 109.73 mm |
| October | 6.9 °C | 19.8 °C | 89.15 mm |
| November | 0.7 °C | 12 °C | 61.98 mm |
| December | -4.7 °C | 5.7 °C | 46.48 mm |
| Annual | 6.5 °C | 18.2 °C | 1091.44 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |