Butlertown, Maryland has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.4 °C (low) to 18.9 °C (high). Annual precipitation averages 1186.7 Millimeters. Butlertown is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -3.1 °C | 6 °C | 88.14 mm |
| February | -2.6 °C | 7.4 °C | 72.39 mm |
| March | 1.3 °C | 11.9 °C | 104.14 mm |
| April | 7 °C | 18.6 °C | 91.69 mm |
| May | 12.3 °C | 23.7 °C | 103.12 mm |
| June | 17.6 °C | 28.5 °C | 113.54 mm |
| July | 20.4 °C | 31 °C | 112.52 mm |
| August | 19.5 °C | 30.3 °C | 105.41 mm |
| September | 15.8 °C | 26.7 °C | 116.33 mm |
| October | 9.3 °C | 20.3 °C | 101.6 mm |
| November | 3.6 °C | 13.8 °C | 81.28 mm |
| December | -0.6 °C | 8.3 °C | 96.52 mm |
| Annual | 8.4 °C | 18.9 °C | 1186.68 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7b : -15°C to -12.2°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |