Butler, Ohio has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.1 °C (low) to 15.5 °C (high). Annual precipitation averages 1075.2 Millimeters. Butler is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -8.1 °C | 1.1 °C | 86.87 mm |
| February | -7.3 °C | 2.7 °C | 62.74 mm |
| March | -2.8 °C | 8.3 °C | 81.53 mm |
| April | 3 °C | 15.8 °C | 99.57 mm |
| May | 8.9 °C | 21.5 °C | 114.55 mm |
| June | 14.2 °C | 26.3 °C | 125.73 mm |
| July | 15.9 °C | 28.1 °C | 101.85 mm |
| August | 14.9 °C | 27.4 °C | 92.2 mm |
| September | 10.8 °C | 24.2 °C | 81.53 mm |
| October | 4.6 °C | 17.3 °C | 74.93 mm |
| November | -0.5 °C | 9.9 °C | 74.93 mm |
| December | -4.8 °C | 3.7 °C | 78.74 mm |
| Annual | 4.1 °C | 15.5 °C | 1075.17 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| 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 | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |