Lochearn, Maryland has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 7.6 °C (low) to 18.8 °C (high). Annual precipitation averages 1197.4 Millimeters. Lochearn is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -3.9 °C | 5.9 °C | 91.44 mm |
| February | -2.9 °C | 7.6 °C | 72.39 mm |
| March | 0.8 °C | 12.3 °C | 108.71 mm |
| April | 6.4 °C | 18.9 °C | 99.31 mm |
| May | 11.6 °C | 23.9 °C | 110.49 mm |
| June | 16.7 °C | 28.7 °C | 106.17 mm |
| July | 19.5 °C | 31.1 °C | 111 mm |
| August | 18.4 °C | 30 °C | 90.42 mm |
| September | 14.7 °C | 26.2 °C | 118.11 mm |
| October | 8.1 °C | 19.8 °C | 106.17 mm |
| November | 2.7 °C | 13.6 °C | 84.84 mm |
| December | -1.2 °C | 8.1 °C | 98.3 mm |
| Annual | 7.6 °C | 18.8 °C | 1197.35 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| 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 | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |