Bluffton, Indiana has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5 °C (low) to 15.9 °C (high). Annual precipitation averages 1040.1 Millimeters. Bluffton is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -7.9 °C | 0.6 °C | 67.31 mm |
| February | -6.7 °C | 2.6 °C | 56.39 mm |
| March | -2 °C | 8.7 °C | 70.1 mm |
| April | 3.9 °C | 16 °C | 101.85 mm |
| May | 10.1 °C | 22.2 °C | 116.33 mm |
| June | 15.7 °C | 27.2 °C | 119.63 mm |
| July | 17.4 °C | 29 °C | 113.28 mm |
| August | 16.1 °C | 28 °C | 101.85 mm |
| September | 11.9 °C | 25.1 °C | 77.98 mm |
| October | 5.8 °C | 18.2 °C | 73.41 mm |
| November | 0.2 °C | 9.9 °C | 78.23 mm |
| December | -4.7 °C | 3.3 °C | 63.75 mm |
| Annual | 5 °C | 15.9 °C | 1040.11 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |