Barrelville, Maryland has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.2 °C (low) to 17.5 °C (high). Annual precipitation averages 1052.3 Millimeters. Barrelville is located in USDA Plant Hardiness Zone 7a. 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 | -5.3 °C | 3.7 °C | 69.34 mm |
| February | -4.8 °C | 5.7 °C | 68.83 mm |
| March | -1.2 °C | 10.5 °C | 93.47 mm |
| April | 4.1 °C | 18.4 °C | 92.46 mm |
| May | 9.3 °C | 23.2 °C | 116.84 mm |
| June | 14.1 °C | 27.4 °C | 107.44 mm |
| July | 16.4 °C | 29.8 °C | 90.68 mm |
| August | 15.5 °C | 28.9 °C | 83.31 mm |
| September | 11.7 °C | 25.3 °C | 96.01 mm |
| October | 5.6 °C | 18.8 °C | 79.25 mm |
| November | 0.4 °C | 11.8 °C | 72.64 mm |
| December | -3.2 °C | 6 °C | 82.04 mm |
| Annual | 5.2 °C | 17.5 °C | 1052.31 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |