| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°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. 11 - Oct. 20 |
| Average Last Frost Date: | May 1 - May 10 |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers |
| Ecoregion: | 55b - Loamy High Lime Till Plains |
| Heat Zone Days: | 15 - 30 days Over 86°F |
Annual Climate Data for ZIP Code 46135 - Greencastle, IN | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 18 | 22 | 31 | 41 | 52 | 61 | 65 | 63 | 55 | 44 | 34 | 23 | 42 |
| Avg Max Temp (°F) | 34 | 40 | 51 | 63 | 74 | 82 | 86 | 84 | 78 | 66 | 52 | 39 | 63 |
| Avg Precip (In.) | 2.46 | 2.5 | 3.59 | 3.84 | 4.81 | 4.28 | 5.02 | 4.21 | 3.24 | 3.08 | 3.94 | 3.11 | 44.1 |