West Lafayette, Indiana has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.7 °C (low) to 16.7 °C (high). Annual precipitation averages 1017.5 Millimeters. West Lafayette 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 | -7.7 °C | 1.2 °C | 65.79 mm |
| February | -5.9 °C | 3.5 °C | 53.85 mm |
| March | -0.9 °C | 9.9 °C | 72.39 mm |
| April | 5.1 °C | 17.2 °C | 99.31 mm |
| May | 11.2 °C | 23.3 °C | 111.25 mm |
| June | 16.1 °C | 28 °C | 120.14 mm |
| July | 17.9 °C | 29.3 °C | 109.73 mm |
| August | 16.6 °C | 28.6 °C | 85.34 mm |
| September | 12.6 °C | 25.9 °C | 76.96 mm |
| October | 6.4 °C | 19 °C | 76.45 mm |
| November | 0.7 °C | 10.7 °C | 80.77 mm |
| December | -4.3 °C | 4 °C | 65.53 mm |
| Annual | 5.7 °C | 16.7 °C | 1017.51 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 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |