| 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: | 55a - Clayey High Lime Till Plains |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 46714 - Bluffton, IN | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 16 | 19 | 29 | 39 | 50 | 60 | 64 | 62 | 54 | 42 | 33 | 23 | 41 |
| Avg Max Temp (°F) | 30 | 35 | 46 | 59 | 71 | 80 | 84 | 82 | 76 | 63 | 48 | 36 | 59 |
| Avg Precip (In.) | 2.06 | 1.9 | 2.76 | 3.51 | 3.8 | 4.15 | 3.91 | 3.59 | 2.95 | 2.58 | 3.07 | 2.67 | 36.94 |