Ventura, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 2.1 °C (low) to 13 °C (high). Annual precipitation averages 897.1 Millimeters. Ventura is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -13.9 °C | -4.6 °C | 23.11 mm |
| February | -11.6 °C | -2 °C | 25.91 mm |
| March | -4.8 °C | 4.9 °C | 50.55 mm |
| April | 1.7 °C | 13.6 °C | 97.03 mm |
| May | 8.7 °C | 20.4 °C | 128.78 mm |
| June | 14.7 °C | 25.9 °C | 137.41 mm |
| July | 16.4 °C | 27.7 °C | 113.79 mm |
| August | 14.9 °C | 26.4 °C | 99.06 mm |
| September | 9.9 °C | 23 °C | 84.33 mm |
| October | 3 °C | 15.6 °C | 61.72 mm |
| November | -3.7 °C | 6.3 °C | 42.16 mm |
| December | -10.1 °C | -1.4 °C | 33.27 mm |
| Annual | 2.1 °C | 13 °C | 897.12 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5a : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |