| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 6b: -5°F to 0°F |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F |
| 1990 Hardiness Zone: | Zone 1b: -15F to -10F |
| Average First Frost Date: | Oct. 21 - Oct. 31 |
| 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: | Rare Over 86°F |
Annual Climate Data for ZIP Code 46227 - Indianapolis, IN | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 18 | 21 | 31 | 41 | 51 | 61 | 65 | 62 | 54 | 42 | 33 | 23 | 42 |
| Avg Max Temp (°F) | 34 | 39 | 50 | 62 | 73 | 81 | 85 | 83 | 77 | 65 | 51 | 39 | 62 |
| Avg Precip (In.) | 2.21 | 2.23 | 3.19 | 3.81 | 4.55 | 4.12 | 4.61 | 3.84 | 2.73 | 2.84 | 3.62 | 2.89 | 40.63 |