Chesterton, Indiana has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 41.8 °F (low) to 59.1 °F (high). Annual precipitation averages 40.1 Inches. Chesterton 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. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 18.2 °F | 32.3 °F | 2.42 in. |
| February | 20.7 °F | 35.9 °F | 2.22 in. |
| March | 29.0 °F | 46.1 °F | 2.29 in. |
| April | 39.0 °F | 58.2 °F | 3.6 in. |
| May | 49.3 °F | 69.2 °F | 4.18 in. |
| June | 59.2 °F | 78.4 °F | 4.4 in. |
| July | 64.3 °F | 82.5 °F | 4.22 in. |
| August | 63.3 °F | 81.0 °F | 4.09 in. |
| September | 56.3 °F | 75.3 °F | 3.66 in. |
| October | 44.4 °F | 63.2 °F | 4.06 in. |
| November | 33.9 °F | 49.4 °F | 2.76 in. |
| December | 24.3 °F | 37.6 °F | 2.24 in. |
| Annual | 41.8 °F | 59.1 °F | 40.14 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |