Butler, Indiana has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 39.7 °F (low) to 59.9 °F (high). Annual precipitation averages 37.5 Inches. Butler 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 | 17.0 °F | 32.2 °F | 2.31 in. |
| February | 18.7 °F | 35.8 °F | 1.95 in. |
| March | 27.1 °F | 46.6 °F | 2.55 in. |
| April | 37.3 °F | 60.2 °F | 3.76 in. |
| May | 48.9 °F | 71.5 °F | 4.36 in. |
| June | 58.7 °F | 80.6 °F | 3.88 in. |
| July | 61.8 °F | 84.2 °F | 3.77 in. |
| August | 59.8 °F | 82.1 °F | 3.62 in. |
| September | 52.2 °F | 76.4 °F | 3.1 in. |
| October | 41.3 °F | 63.6 °F | 2.86 in. |
| November | 31.3 °F | 48.9 °F | 2.99 in. |
| December | 22.7 °F | 37.0 °F | 2.37 in. |
| Annual | 39.7 °F | 59.9 °F | 37.52 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |