Balltown, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 3.1 °C (low) to 13.4 °C (high). Annual precipitation averages 969 Millimeters. Balltown is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -12.3 °C | -3.4 °C | 31.75 mm |
| February | -10.3 °C | -0.9 °C | 34.54 mm |
| March | -3.8 °C | 6.2 °C | 51.56 mm |
| April | 2.6 °C | 13.9 °C | 96.77 mm |
| May | 9.1 °C | 20.3 °C | 115.06 mm |
| June | 14.8 °C | 25.6 °C | 146.56 mm |
| July | 16.8 °C | 27.4 °C | 122.68 mm |
| August | 15.7 °C | 26.4 °C | 100.84 mm |
| September | 11 °C | 22.7 °C | 97.79 mm |
| October | 4.3 °C | 15.5 °C | 73.15 mm |
| November | -2.4 °C | 6.9 °C | 56.13 mm |
| December | -8.5 °C | -0.2 °C | 42.16 mm |
| Annual | 3.1 °C | 13.4 °C | 968.99 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 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 | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |