Darmstadt, Indiana has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.1 °C (low) to 19.2 °C (high). Annual precipitation averages 1247.7 Millimeters. Darmstadt is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -4.2 °C | 4.9 °C | 89.41 mm |
| February | -2.7 °C | 7.6 °C | 81.53 mm |
| March | 1.9 °C | 13.1 °C | 113.79 mm |
| April | 7.7 °C | 19.7 °C | 133.86 mm |
| May | 13.6 °C | 24.8 °C | 135.38 mm |
| June | 18.3 °C | 29.3 °C | 114.81 mm |
| July | 20.1 °C | 30.9 °C | 112.78 mm |
| August | 18.9 °C | 30.6 °C | 77.72 mm |
| September | 14.6 °C | 27.5 °C | 88.9 mm |
| October | 8.3 °C | 21 °C | 90.17 mm |
| November | 2.3 °C | 13.3 °C | 102.11 mm |
| December | -2 °C | 7.2 °C | 107.19 mm |
| Annual | 8.1 °C | 19.2 °C | 1247.65 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |