East Chicago, Indiana has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6.4 °C (low) to 15.1 °C (high). Annual precipitation averages 1003.8 Millimeters. East Chicago 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. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -6.9 °C | 0.5 °C | 59.94 mm |
| February | -5.6 °C | 2.4 °C | 50.55 mm |
| March | -0.7 °C | 7.9 °C | 59.69 mm |
| April | 4.8 °C | 14.4 °C | 85.09 mm |
| May | 10.7 °C | 20.3 °C | 101.09 mm |
| June | 16.2 °C | 25.9 °C | 111.51 mm |
| July | 19.3 °C | 28.2 °C | 112.27 mm |
| August | 18.8 °C | 27.4 °C | 102.11 mm |
| September | 14.6 °C | 24.3 °C | 81.53 mm |
| October | 7.9 °C | 17.3 °C | 101.35 mm |
| November | 1.8 °C | 9.8 °C | 78.49 mm |
| December | -3.8 °C | 3.2 °C | 60.2 mm |
| Annual | 6.4 °C | 15.1 °C | 1003.82 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| 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 |