Friendsville, Maryland has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 3.4 °C (low) to 16.2 °C (high). Annual precipitation averages 1212.3 Millimeters. Friendsville 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 | -7.7 °C | 2.7 °C | 93.47 mm |
| February | -6.8 °C | 4.6 °C | 85.09 mm |
| March | -3.2 °C | 9.5 °C | 102.36 mm |
| April | 2.2 °C | 16.8 °C | 105.92 mm |
| May | 7.8 °C | 21.8 °C | 122.68 mm |
| June | 12.5 °C | 26.1 °C | 123.7 mm |
| July | 14.7 °C | 28 °C | 117.09 mm |
| August | 13.9 °C | 27.3 °C | 103.38 mm |
| September | 9.8 °C | 24 °C | 96.01 mm |
| October | 3.7 °C | 17.7 °C | 85.85 mm |
| November | -1.5 °C | 10.8 °C | 83.31 mm |
| December | -4.9 °C | 5 °C | 93.47 mm |
| Annual | 3.4 °C | 16.2 °C | 1212.33 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 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |