| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F |
| 2012 Hardiness Zone: | 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: | 1 - 7 days Over 86°F |
Annual Climate Data for ZIP Code 46403 - Gary, IN | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 15 | 20 | 29 | 38 | 48 | 58 | 64 | 62 | 55 | 43 | 33 | 21 | 41 |
| Avg Max Temp (°F) | 31 | 37 | 48 | 59 | 71 | 80 | 84 | 82 | 76 | 65 | 49 | 37 | 60 |
| Avg Precip (In.) | 1.95 | 1.6 | 2.67 | 3.44 | 3.87 | 4.42 | 3.46 | 3.33 | 3.64 | 2.9 | 3.24 | 2.55 | 37.08 |