Butler, Indiana has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.3 °C (low) to 15.5 °C (high). Annual precipitation averages 953 Millimeters. 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 | -8.3 °C | 0.1 °C | 58.67 mm |
| February | -7.4 °C | 2.1 °C | 49.53 mm |
| March | -2.7 °C | 8.1 °C | 64.77 mm |
| April | 2.9 °C | 15.7 °C | 95.5 mm |
| May | 9.4 °C | 21.9 °C | 110.74 mm |
| June | 14.8 °C | 27 °C | 98.55 mm |
| July | 16.6 °C | 29 °C | 95.76 mm |
| August | 15.4 °C | 27.8 °C | 91.95 mm |
| September | 11.2 °C | 24.7 °C | 78.74 mm |
| October | 5.2 °C | 17.6 °C | 72.64 mm |
| November | -0.4 °C | 9.4 °C | 75.95 mm |
| December | -5.2 °C | 2.8 °C | 60.2 mm |
| Annual | 4.3 °C | 15.5 °C | 953 mm |
| 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 : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |