Somerset, Maryland has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.3 °C (low) to 19.2 °C (high). Annual precipitation averages 1168.7 Millimeters. Somerset is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -3 °C | 6.4 °C | 79.76 mm |
| February | -2.2 °C | 8.3 °C | 70.61 mm |
| March | 1.4 °C | 13 °C | 101.09 mm |
| April | 7 °C | 19.6 °C | 88.39 mm |
| May | 12.4 °C | 24.2 °C | 115.06 mm |
| June | 17.5 °C | 28.7 °C | 114.81 mm |
| July | 20.2 °C | 31.1 °C | 117.35 mm |
| August | 19.2 °C | 30.1 °C | 93.73 mm |
| September | 15.6 °C | 26.3 °C | 113.03 mm |
| October | 8.8 °C | 20 °C | 100.33 mm |
| November | 3.2 °C | 14 °C | 80.77 mm |
| December | -0.7 °C | 8.6 °C | 93.73 mm |
| Annual | 8.3 °C | 19.2 °C | 1168.66 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 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 | Cfa - Humid Subtropical Climate |