| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 5b: -15°F to -10°F |
| 1990 Hardiness Zone: | Zone 6b: -5F to 0F |
| Average First Frost Date: | Oct. 21 - Oct. 31 |
| Average Last Frost Date: | May 1 - May 10 |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers |
| Ecoregion: | 56d - Michigan Lake Plain |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 46304 - Chesterton, IN | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 16 | 20 | 29 | 38 | 48 | 58 | 64 | 62 | 55 | 43 | 33 | 22 | 41 |
| Avg Max Temp (°F) | 32 | 37 | 48 | 59 | 71 | 81 | 84 | 82 | 76 | 65 | 50 | 37 | 60 |
| Avg Precip (In.) | 2.01 | 1.66 | 2.71 | 3.46 | 3.84 | 4.45 | 3.56 | 3.39 | 3.66 | 2.94 | 3.24 | 2.62 | 37.55 |