Lansdowne, Maryland has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.7 °C (low) to 19 °C (high). Annual precipitation averages 1201.2 Millimeters. Lansdowne 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 | -2.8 °C | 6.2 °C | 84.58 mm |
| February | -1.9 °C | 7.6 °C | 75.18 mm |
| March | 1.8 °C | 12.2 °C | 109.47 mm |
| April | 7.4 °C | 18.8 °C | 93.22 mm |
| May | 12.8 °C | 23.8 °C | 105.92 mm |
| June | 18 °C | 28.8 °C | 112.27 mm |
| July | 20.7 °C | 31.2 °C | 110.74 mm |
| August | 19.7 °C | 30.1 °C | 101.6 mm |
| September | 15.9 °C | 26.4 °C | 117.09 mm |
| October | 9.2 °C | 20 °C | 105.66 mm |
| November | 3.7 °C | 13.9 °C | 83.82 mm |
| December | -0.3 °C | 8.6 °C | 101.6 mm |
| Annual | 8.7 °C | 19 °C | 1201.15 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 7b : -15°C to -12.2°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |