Friendly, Maryland has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.9 °C (low) to 19.3 °C (high). Annual precipitation averages 1164.6 Millimeters. Friendly is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -2.7 °C | 6.6 °C | 78.23 mm |
| February | -1.7 °C | 8.4 °C | 69.34 mm |
| March | 2 °C | 12.9 °C | 98.04 mm |
| April | 7.6 °C | 19.4 °C | 87.38 mm |
| May | 12.9 °C | 24.1 °C | 113.28 mm |
| June | 18.1 °C | 28.7 °C | 117.09 mm |
| July | 20.8 °C | 31.2 °C | 119.38 mm |
| August | 19.8 °C | 30.2 °C | 96.52 mm |
| September | 16.2 °C | 26.5 °C | 111.51 mm |
| October | 9.6 °C | 20.1 °C | 98.81 mm |
| November | 3.8 °C | 14.1 °C | 79.25 mm |
| December | -0.2 °C | 8.8 °C | 95.76 mm |
| Annual | 8.9 °C | 19.3 °C | 1164.59 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 50-75 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 | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |