Bethel, Ohio has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 7.1 °C (low) to 17.9 °C (high). Annual precipitation averages 1160 Millimeters. Bethel is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -4.9 °C | 4.1 °C | 81.03 mm |
| February | -3.5 °C | 6.5 °C | 77.22 mm |
| March | 0.8 °C | 11.8 °C | 110.24 mm |
| April | 6.4 °C | 18.3 °C | 116.59 mm |
| May | 12.2 °C | 23.3 °C | 123.44 mm |
| June | 16.7 °C | 27.9 °C | 115.82 mm |
| July | 18.6 °C | 29.6 °C | 118.11 mm |
| August | 17.8 °C | 29.3 °C | 92.96 mm |
| September | 13.8 °C | 25.9 °C | 78.23 mm |
| October | 7.2 °C | 19.5 °C | 75.44 mm |
| November | 1.8 °C | 12.1 °C | 81.53 mm |
| December | -2.1 °C | 6.4 °C | 89.41 mm |
| Annual | 7.1 °C | 17.9 °C | 1160.02 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |