Colesville, Maryland has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 7.9 °C (low) to 18.7 °C (high). Annual precipitation averages 1165.3 Millimeters. Colesville is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -3.6 °C | 5.8 °C | 79.5 mm |
| February | -2.7 °C | 7.6 °C | 70.36 mm |
| March | 1.1 °C | 12.3 °C | 102.36 mm |
| April | 6.7 °C | 19.2 °C | 89.15 mm |
| May | 12.3 °C | 23.7 °C | 113.28 mm |
| June | 17.1 °C | 28.3 °C | 116.59 mm |
| July | 19.7 °C | 30.6 °C | 111 mm |
| August | 18.8 °C | 29.6 °C | 94.74 mm |
| September | 15.1 °C | 25.8 °C | 113.79 mm |
| October | 8.4 °C | 19.5 °C | 98.55 mm |
| November | 2.7 °C | 13.4 °C | 80.77 mm |
| December | -1.1 °C | 8.1 °C | 95.25 mm |
| Annual | 7.9 °C | 18.7 °C | 1165.34 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 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 | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |