Ventura, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 35.8 °F (low) to 55.4 °F (high). Annual precipitation averages 35.3 Inches. 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 | 6.9 °F | 23.8 °F | 0.91 in. |
| February | 11.1 °F | 28.4 °F | 1.02 in. |
| March | 23.3 °F | 40.9 °F | 1.99 in. |
| April | 35.0 °F | 56.4 °F | 3.82 in. |
| May | 47.6 °F | 68.7 °F | 5.07 in. |
| June | 58.4 °F | 78.7 °F | 5.41 in. |
| July | 61.6 °F | 81.8 °F | 4.48 in. |
| August | 58.8 °F | 79.6 °F | 3.9 in. |
| September | 49.9 °F | 73.4 °F | 3.32 in. |
| October | 37.4 °F | 60.1 °F | 2.43 in. |
| November | 25.4 °F | 43.3 °F | 1.66 in. |
| December | 13.8 °F | 29.5 °F | 1.31 in. |
| Annual | 35.8 °F | 55.4 °F | 35.32 in. |
| 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 : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |