Harrodsburg, Indiana has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.9 °C (low) to 18.2 °C (high). Annual precipitation averages 1237 Millimeters. Harrodsburg is located in USDA Plant Hardiness Zone 6b. 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 | -6.1 °C | 3.5 °C | 89.66 mm |
| February | -4.6 °C | 6.3 °C | 73.15 mm |
| March | -0.2 °C | 12 °C | 97.03 mm |
| April | 5.3 °C | 18.8 °C | 131.06 mm |
| May | 11.3 °C | 23.9 °C | 142.24 mm |
| June | 16.2 °C | 28.3 °C | 127 mm |
| July | 17.8 °C | 30.3 °C | 115.06 mm |
| August | 16.6 °C | 29.9 °C | 87.63 mm |
| September | 12.3 °C | 26.6 °C | 92.96 mm |
| October | 5.7 °C | 20.2 °C | 92.46 mm |
| November | 0.3 °C | 12.3 °C | 100.08 mm |
| December | -3.5 °C | 6 °C | 88.65 mm |
| Annual | 5.9 °C | 18.2 °C | 1236.98 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 6b : -20.6°C to -17.8°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 |