Bentleyville, Ohio has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 5.1 °C (low) to 15.2 °C (high). Annual precipitation averages 1095.3 Millimeters. Bentleyville is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -6.9 °C | 1.3 °C | 79.25 mm |
| February | -6.5 °C | 2.6 °C | 60.71 mm |
| March | -2.3 °C | 7.4 °C | 83.06 mm |
| April | 3.8 °C | 14.7 °C | 98.81 mm |
| May | 9.6 °C | 21.3 °C | 103.63 mm |
| June | 14.7 °C | 25.9 °C | 106.68 mm |
| July | 16.9 °C | 28.2 °C | 107.44 mm |
| August | 15.9 °C | 27.3 °C | 95.5 mm |
| September | 12.2 °C | 23.6 °C | 101.6 mm |
| October | 6.3 °C | 16.8 °C | 93.47 mm |
| November | 1.2 °C | 9.9 °C | 83.06 mm |
| December | -3.3 °C | 3.8 °C | 82.04 mm |
| Annual | 5.1 °C | 15.2 °C | 1095.25 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |