Oakville, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.5 °C (low) to 16.1 °C (high). Annual precipitation averages 933.2 Millimeters. Oakville is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -9.1 °C | -0.2 °C | 36.83 mm |
| February | -7.3 °C | 2.2 °C | 43.94 mm |
| March | -1.2 °C | 9.2 °C | 62.48 mm |
| April | 4.9 °C | 16.7 °C | 90.68 mm |
| May | 11.4 °C | 22.6 °C | 121.92 mm |
| June | 16.9 °C | 27.9 °C | 121.16 mm |
| July | 18.8 °C | 30 °C | 95.25 mm |
| August | 17.5 °C | 28.8 °C | 99.82 mm |
| September | 13 °C | 25.2 °C | 87.63 mm |
| October | 6.4 °C | 18.1 °C | 70.36 mm |
| November | 0 °C | 9.9 °C | 56.39 mm |
| December | -5.8 °C | 2.6 °C | 46.74 mm |
| Annual | 5.5 °C | 16.1 °C | 933.2 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |