| 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 46229 - Indianapolis, IN | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 17 | 20 | 30 | 40 | 51 | 60 | 64 | 62 | 54 | 42 | 33 | 23 | 41 |
| Avg Max Temp (°F) | 34 | 39 | 50 | 62 | 72 | 81 | 85 | 83 | 77 | 65 | 51 | 39 | 61 |
| Avg Precip (In.) | 2.33 | 2.3 | 3.22 | 3.93 | 4.61 | 4.17 | 4.57 | 3.91 | 2.98 | 2.91 | 3.67 | 2.98 | 41.57 |