| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F |
| 2012 Hardiness Zone: | Zone 5b: -15°F to -10°F |
| 1990 Hardiness Zone: | Zone 5a: -20F to -15F |
| 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: | 56b - Elkhart Till Plains |
| Heat Zone Days: | 1 - 7 days Over 86°F |
Annual Climate Data for ZIP Code 46504 - Bourbon, IN | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 15 | 18 | 28 | 38 | 49 | 58 | 62 | 60 | 53 | 41 | 32 | 21 | 40 |
| Avg Max Temp (°F) | 31 | 36 | 48 | 60 | 72 | 81 | 84 | 82 | 76 | 63 | 49 | 36 | 60 |
| Avg Precip (In.) | 2.01 | 1.74 | 2.63 | 3.61 | 3.94 | 4.36 | 3.8 | 3.7 | 3.45 | 3.03 | 3.16 | 2.74 | 38.16 |