Bethany, Indiana has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6 °C (low) to 17.1 °C (high). Annual precipitation averages 1161.8 Millimeters. Bethany 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 | -6.6 °C | 2.4 °C | 79.5 mm |
| February | -5.1 °C | 4.8 °C | 65.28 mm |
| March | -0.6 °C | 10.8 °C | 87.12 mm |
| April | 5.3 °C | 17.7 °C | 124.46 mm |
| May | 11.2 °C | 22.9 °C | 129.03 mm |
| June | 16.3 °C | 27.6 °C | 135.13 mm |
| July | 18.1 °C | 29.3 °C | 110.49 mm |
| August | 17.2 °C | 28.9 °C | 82.55 mm |
| September | 12.8 °C | 25.8 °C | 87.63 mm |
| October | 6.2 °C | 19.1 °C | 88.65 mm |
| November | 0.6 °C | 11.3 °C | 90.68 mm |
| December | -3.7 °C | 4.9 °C | 81.28 mm |
| Annual | 6 °C | 17.1 °C | 1161.8 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 |