Butler, Kentucky has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6.8 °C (low) to 18.6 °C (high). Annual precipitation averages 1137.9 Millimeters. Butler is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -4.8 °C | 4.8 °C | 81.79 mm |
| February | -3.6 °C | 7.2 °C | 75.18 mm |
| March | 0.3 °C | 12.4 °C | 107.19 mm |
| April | 5.7 °C | 19 °C | 111.25 mm |
| May | 11.5 °C | 23.8 °C | 122.68 mm |
| June | 16.3 °C | 28.4 °C | 116.33 mm |
| July | 18.6 °C | 30.3 °C | 115.57 mm |
| August | 17.7 °C | 29.8 °C | 84.07 mm |
| September | 13.6 °C | 26.8 °C | 78.99 mm |
| October | 6.7 °C | 20.3 °C | 76.96 mm |
| November | 1.2 °C | 13 °C | 79.25 mm |
| December | -2.1 °C | 7.2 °C | 88.65 mm |
| Annual | 6.8 °C | 18.6 °C | 1137.91 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°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 |