Bluffton, Ohio has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 41.6 °F (low) to 60.2 °F (high). Annual precipitation averages 38.4 Inches. 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 | 18.9 °F | 33.3 °F | 2.63 in. |
| February | 20.6 °F | 36.4 °F | 2.18 in. |
| March | 28.8 °F | 46.9 °F | 2.66 in. |
| April | 39.2 °F | 60.4 °F | 3.73 in. |
| May | 50.8 °F | 71.5 °F | 4.15 in. |
| June | 60.4 °F | 80.3 °F | 4.28 in. |
| July | 63.4 °F | 83.8 °F | 4.12 in. |
| August | 61.5 °F | 82.0 °F | 3.52 in. |
| September | 54.3 °F | 76.5 °F | 3.03 in. |
| October | 43.4 °F | 63.8 °F | 2.78 in. |
| November | 33.2 °F | 49.8 °F | 2.8 in. |
| December | 24.7 °F | 38.2 °F | 2.55 in. |
| Annual | 41.6 °F | 60.2 °F | 38.43 in. |
| 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 : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |