Sykesville, Pennsylvania has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 3 °C (low) to 14.8 °C (high). Annual precipitation averages 1109.2 Millimeters. Sykesville is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -8.3 °C | 0.8 °C | 79.5 mm |
| February | -7.8 °C | 2.4 °C | 60.71 mm |
| March | -4.1 °C | 7.4 °C | 81.53 mm |
| April | 1.6 °C | 15.2 °C | 92.46 mm |
| May | 7.3 °C | 21.1 °C | 97.54 mm |
| June | 12.2 °C | 25 °C | 112.78 mm |
| July | 14.4 °C | 27.1 °C | 120.9 mm |
| August | 13.6 °C | 26.6 °C | 100.84 mm |
| September | 9.8 °C | 22.8 °C | 102.36 mm |
| October | 3.8 °C | 16.2 °C | 86.11 mm |
| November | -1.2 °C | 9.2 °C | 85.6 mm |
| December | -5 °C | 3.2 °C | 88.9 mm |
| Annual | 3 °C | 14.8 °C | 1109.23 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |