Mount Lena, Maryland has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6.7 °C (low) to 18 °C (high). Annual precipitation averages 1090.9 Millimeters. Mount Lena is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -4.4 °C | 4.7 °C | 79.5 mm |
| February | -3.8 °C | 6.7 °C | 63.25 mm |
| March | 0.3 °C | 11.3 °C | 93.22 mm |
| April | 5.6 °C | 18.2 °C | 97.54 mm |
| May | 10.8 °C | 23.1 °C | 109.98 mm |
| June | 15.8 °C | 27.9 °C | 97.28 mm |
| July | 18.2 °C | 30.3 °C | 95.76 mm |
| August | 17.2 °C | 29.4 °C | 88.14 mm |
| September | 13.3 °C | 25.5 °C | 105.66 mm |
| October | 7.4 °C | 19.1 °C | 93.22 mm |
| November | 1.8 °C | 12.6 °C | 82.04 mm |
| December | -2.2 °C | 6.7 °C | 85.34 mm |
| Annual | 6.7 °C | 18 °C | 1090.93 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |