Dupont, Indiana has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6.5 °C (low) to 18 °C (high). Annual precipitation averages 1238 Millimeters. Dupont is located in USDA Plant Hardiness Zone 6b. 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 | -5.4 °C | 3.8 °C | 87.38 mm |
| February | -4.3 °C | 6.2 °C | 77.72 mm |
| March | 0.4 °C | 12.1 °C | 105.92 mm |
| April | 6.1 °C | 18.6 °C | 127.25 mm |
| May | 11.7 °C | 23.6 °C | 133.1 mm |
| June | 16.3 °C | 27.9 °C | 125.48 mm |
| July | 18.2 °C | 29.6 °C | 111.25 mm |
| August | 17.2 °C | 29.1 °C | 101.09 mm |
| September | 13.1 °C | 26.2 °C | 86.87 mm |
| October | 6.6 °C | 19.7 °C | 88.65 mm |
| November | 1.1 °C | 12.4 °C | 93.22 mm |
| December | -3 °C | 6.2 °C | 100.08 mm |
| Annual | 6.5 °C | 18 °C | 1238.01 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| 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 | Dfa - Humid Continental Hot Summers With Year Around Precipitation |