Clarksburg, Indiana has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.7 °C (low) to 16.7 °C (high). Annual precipitation averages 1159.5 Millimeters. Clarksburg is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -6.8 °C | 2.2 °C | 85.09 mm |
| February | -5.4 °C | 4.5 °C | 68.83 mm |
| March | -0.9 °C | 10.3 °C | 95.25 mm |
| April | 5.1 °C | 17.1 °C | 120.9 mm |
| May | 11 °C | 22.6 °C | 128.27 mm |
| June | 15.9 °C | 27.1 °C | 128.02 mm |
| July | 17.6 °C | 28.7 °C | 105.41 mm |
| August | 16.6 °C | 28.2 °C | 85.09 mm |
| September | 12.4 °C | 25.2 °C | 81.28 mm |
| October | 6.4 °C | 18.6 °C | 82.55 mm |
| November | 0.5 °C | 11.1 °C | 89.15 mm |
| December | -3.6 °C | 4.7 °C | 89.66 mm |
| Annual | 5.7 °C | 16.7 °C | 1159.5 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |