| 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 Zone 5b: -15°F to -10°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: | 1 - 7 days Over 86°F |
Annual Climate Data for ZIP Code 46254 - Indianapolis, IN | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 18 | 22 | 31 | 41 | 51 | 61 | 65 | 62 | 55 | 43 | 34 | 23 | 42 |
| Avg Max Temp (°F) | 34 | 40 | 51 | 62 | 73 | 82 | 85 | 83 | 77 | 65 | 51 | 39 | 62 |
| Avg Precip (In.) | 2.35 | 2.33 | 3.29 | 3.77 | 4.45 | 4.13 | 4.5 | 3.8 | 2.9 | 2.85 | 3.6 | 2.96 | 40.91 |