Damascus, Maryland has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 7.8 °C (low) to 17.3 °C (high). Annual precipitation averages 1197.9 Millimeters. Damascus 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. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -3.5 °C | 4.4 °C | 83.06 mm |
| February | -2.2 °C | 6.2 °C | 72.9 mm |
| March | 1.3 °C | 11 °C | 104.14 mm |
| April | 6.6 °C | 17.5 °C | 90.68 mm |
| May | 11.8 °C | 22.3 °C | 116.59 mm |
| June | 16.4 °C | 26.9 °C | 120.14 mm |
| July | 18.9 °C | 29.3 °C | 111 mm |
| August | 18 °C | 28.2 °C | 93.98 mm |
| September | 14.9 °C | 24.5 °C | 117.86 mm |
| October | 8.6 °C | 18.1 °C | 104.14 mm |
| November | 3.8 °C | 12.2 °C | 86.11 mm |
| December | -0.9 °C | 6.6 °C | 97.28 mm |
| Annual | 7.8 °C | 17.3 °C | 1197.88 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| 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 | Dfa - Humid Continental Hot Summers With Year Around Precipitation |