Leavenworth, Indiana has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 6.8 °C (low) to 19.3 °C (high). Annual precipitation averages 1322.1 Millimeters. Leavenworth is located in USDA Plant Hardiness Zone 6b. 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 | -4.9 °C | 5.6 °C | 97.28 mm |
| February | -3.4 °C | 8.2 °C | 93.22 mm |
| March | 0.7 °C | 13.6 °C | 124.46 mm |
| April | 6.1 °C | 20 °C | 132.59 mm |
| May | 11.7 °C | 24.7 °C | 145.03 mm |
| June | 16.5 °C | 28.9 °C | 125.22 mm |
| July | 18.6 °C | 30.6 °C | 115.32 mm |
| August | 17.4 °C | 30.3 °C | 80.77 mm |
| September | 13.3 °C | 27.2 °C | 100.08 mm |
| October | 6.8 °C | 21.1 °C | 96.77 mm |
| November | 1.2 °C | 13.7 °C | 99.31 mm |
| December | -2.5 °C | 7.7 °C | 112.01 mm |
| Annual | 6.8 °C | 19.3 °C | 1322.06 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 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 | Cfa - Humid Subtropical Climate |