| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F |
| 1990 Hardiness Zone: | Zone 1b: -15F to -10F |
| Average First Frost Date: | Oct. 11 - Oct. 20 |
| Average Last Frost Date: | Apr. 21 - Apr. 30 |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers |
| Ecoregion: | 55b - Loamy High Lime Till Plains |
| Heat Zone Days: | 1 - 7 days Over 86°F |
Annual Climate Data for ZIP Code 46256 - Indianapolis, IN | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 17 | 20 | 29 | 39 | 50 | 60 | 64 | 61 | 54 | 42 | 33 | 22 | 41 |
| Avg Max Temp (°F) | 34 | 39 | 50 | 61 | 72 | 81 | 84 | 83 | 77 | 65 | 51 | 38 | 61 |
| Avg Precip (In.) | 2.36 | 2.36 | 3.21 | 3.89 | 4.66 | 4.12 | 4.46 | 3.97 | 3.19 | 2.95 | 3.66 | 3.05 | 41.89 |