Westville, Indiana has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.8 °C (low) to 15 °C (high). Annual precipitation averages 1034.5 Millimeters. Westville 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 | -8.4 °C | -0.2 °C | 62.74 mm |
| February | -7.1 °C | 1.8 °C | 55.37 mm |
| March | -2.2 °C | 7.8 °C | 60.96 mm |
| April | 3.4 °C | 14.9 °C | 91.19 mm |
| May | 9.6 °C | 21.1 °C | 105.66 mm |
| June | 15.2 °C | 26.2 °C | 113.03 mm |
| July | 17.2 °C | 27.9 °C | 109.22 mm |
| August | 16.2 °C | 27.1 °C | 108.71 mm |
| September | 12.1 °C | 24 °C | 89.41 mm |
| October | 5.9 °C | 17.2 °C | 104.65 mm |
| November | 0.4 °C | 9.3 °C | 73.66 mm |
| December | -5.2 °C | 2.7 °C | 59.94 mm |
| Annual | 4.8 °C | 15 °C | 1034.54 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 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 |