Balltown, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 37.5 °F (low) to 56 °F (high). Annual precipitation averages 38.2 Inches. 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 | 9.8 °F | 25.8 °F | 1.25 in. |
| February | 13.5 °F | 30.3 °F | 1.36 in. |
| March | 25.1 °F | 43.1 °F | 2.03 in. |
| April | 36.7 °F | 57.0 °F | 3.81 in. |
| May | 48.4 °F | 68.6 °F | 4.53 in. |
| June | 58.6 °F | 78.1 °F | 5.77 in. |
| July | 62.3 °F | 81.3 °F | 4.83 in. |
| August | 60.2 °F | 79.6 °F | 3.97 in. |
| September | 51.8 °F | 72.8 °F | 3.85 in. |
| October | 39.7 °F | 59.9 °F | 2.88 in. |
| November | 27.7 °F | 44.4 °F | 2.21 in. |
| December | 16.7 °F | 31.6 °F | 1.66 in. |
| Annual | 37.5 °F | 56 °F | 38.15 in. |
| 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 : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |