Friendsville, Maryland has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 38.1 °F (low) to 61.1 °F (high). Annual precipitation averages 47.7 Inches. 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 | 18.2 °F | 36.8 °F | 3.68 in. |
| February | 19.8 °F | 40.3 °F | 3.35 in. |
| March | 26.3 °F | 49.1 °F | 4.03 in. |
| April | 36.0 °F | 62.2 °F | 4.17 in. |
| May | 46.0 °F | 71.2 °F | 4.83 in. |
| June | 54.5 °F | 78.9 °F | 4.87 in. |
| July | 58.4 °F | 82.4 °F | 4.61 in. |
| August | 57.0 °F | 81.2 °F | 4.07 in. |
| September | 49.6 °F | 75.2 °F | 3.78 in. |
| October | 38.6 °F | 63.8 °F | 3.38 in. |
| November | 29.3 °F | 51.4 °F | 3.28 in. |
| December | 23.2 °F | 41.0 °F | 3.68 in. |
| Annual | 38.1 °F | 61.1 °F | 47.73 in. |
| 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 : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |