Rossville, Indiana has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.6 °C (low) to 16.5 °C (high). Annual precipitation averages 1053.1 Millimeters. Rossville 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 | -7.4 °C | 1.1 °C | 68.83 mm |
| February | -6.1 °C | 3.2 °C | 56.9 mm |
| March | -1 °C | 9.7 °C | 74.17 mm |
| April | 4.8 °C | 17 °C | 99.82 mm |
| May | 11.1 °C | 22.9 °C | 112.01 mm |
| June | 16.1 °C | 27.6 °C | 127.51 mm |
| July | 17.7 °C | 29 °C | 118.36 mm |
| August | 16.6 °C | 28.3 °C | 92.2 mm |
| September | 12.4 °C | 25.7 °C | 78.49 mm |
| October | 6.2 °C | 18.7 °C | 77.98 mm |
| November | 0.7 °C | 10.5 °C | 81.53 mm |
| December | -4.2 °C | 3.8 °C | 65.28 mm |
| Annual | 5.6 °C | 16.5 °C | 1053.08 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 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |