East Chicago, Indiana has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 43.6 °F (low) to 59.3 °F (high). Annual precipitation averages 39.5 Inches. 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 | 19.5 °F | 32.9 °F | 2.36 in. |
| February | 22.0 °F | 36.4 °F | 1.99 in. |
| March | 30.8 °F | 46.3 °F | 2.35 in. |
| April | 40.7 °F | 57.9 °F | 3.35 in. |
| May | 51.2 °F | 68.6 °F | 3.98 in. |
| June | 61.2 °F | 78.6 °F | 4.39 in. |
| July | 66.7 °F | 82.7 °F | 4.42 in. |
| August | 65.8 °F | 81.4 °F | 4.02 in. |
| September | 58.3 °F | 75.7 °F | 3.21 in. |
| October | 46.3 °F | 63.1 °F | 3.99 in. |
| November | 35.3 °F | 49.7 °F | 3.09 in. |
| December | 25.2 °F | 37.8 °F | 2.37 in. |
| Annual | 43.6 °F | 59.3 °F | 39.52 in. |
| 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 : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |