Bethany, Indiana has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 42.8 °F (low) to 62.8 °F (high). Annual precipitation averages 45.7 Inches. 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 | 20.1 °F | 36.3 °F | 3.13 in. |
| February | 22.9 °F | 40.7 °F | 2.57 in. |
| March | 31.0 °F | 51.5 °F | 3.43 in. |
| April | 41.5 °F | 63.8 °F | 4.9 in. |
| May | 52.2 °F | 73.3 °F | 5.08 in. |
| June | 61.3 °F | 81.6 °F | 5.32 in. |
| July | 64.6 °F | 84.7 °F | 4.35 in. |
| August | 62.9 °F | 84.0 °F | 3.25 in. |
| September | 55.1 °F | 78.4 °F | 3.45 in. |
| October | 43.2 °F | 66.3 °F | 3.49 in. |
| November | 33.1 °F | 52.4 °F | 3.57 in. |
| December | 25.4 °F | 40.8 °F | 3.2 in. |
| Annual | 42.8 °F | 62.8 °F | 45.74 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 |