Knightstown, Indiana has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.4 °C (low) to 16.4 °C (high). Annual precipitation averages 1184.4 Millimeters. Knightstown is located in USDA Plant Hardiness Zone 6a. 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 | -7.2 °C | 1.6 °C | 87.63 mm |
| February | -5.8 °C | 3.8 °C | 65.53 mm |
| March | -1.1 °C | 9.7 °C | 92.96 mm |
| April | 4.7 °C | 16.8 °C | 121.16 mm |
| May | 10.9 °C | 22.5 °C | 133.35 mm |
| June | 15.9 °C | 27.2 °C | 139.95 mm |
| July | 17.3 °C | 28.8 °C | 111.76 mm |
| August | 16.3 °C | 28.2 °C | 85.85 mm |
| September | 12.1 °C | 25.3 °C | 86.11 mm |
| October | 5.9 °C | 18.5 °C | 84.58 mm |
| November | 0.3 °C | 10.7 °C | 91.95 mm |
| December | -4.3 °C | 4.1 °C | 83.57 mm |
| Annual | 5.4 °C | 16.4 °C | 1184.4 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| 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 |