Lansdowne, Pennsylvania has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 48 °F (low) to 64.6 °F (high). Annual precipitation averages 46.8 Inches. 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 Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 27.1 °F | 41.0 °F | 3.48 in. |
| February | 28.3 °F | 43.7 °F | 2.81 in. |
| March | 35.0 °F | 51.6 °F | 4.3 in. |
| April | 45.2 °F | 64.1 °F | 3.59 in. |
| May | 54.9 °F | 73.1 °F | 3.81 in. |
| June | 64.4 °F | 82.8 °F | 4.26 in. |
| July | 69.8 °F | 87.1 °F | 4.51 in. |
| August | 68.3 °F | 85.2 °F | 4.71 in. |
| September | 61.6 °F | 78.9 °F | 4.23 in. |
| October | 49.8 °F | 66.7 °F | 3.82 in. |
| November | 39.7 °F | 55.6 °F | 3.06 in. |
| December | 32.4 °F | 45.8 °F | 4.22 in. |
| Annual | 48 °F | 64.6 °F | 46.8 in. |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7b : 5°F to 10°F |
| Plant Hardiness Zone - 2012 | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |