Lansdale, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6.3 °C (low) to 17.4 °C (high). Annual precipitation averages 1211.8 Millimeters. Lansdale is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -5.4 °C | 3.9 °C | 83.31 mm |
| February | -4.6 °C | 5.4 °C | 70.61 mm |
| March | -0.7 °C | 10.2 °C | 100.33 mm |
| April | 5 °C | 17.1 °C | 96.77 mm |
| May | 10.4 °C | 22.4 °C | 103.12 mm |
| June | 15.6 °C | 27.4 °C | 110.24 mm |
| July | 18.3 °C | 30 °C | 117.6 mm |
| August | 17.4 °C | 29.1 °C | 111.76 mm |
| September | 13.4 °C | 25.4 °C | 113.28 mm |
| October | 6.8 °C | 18.6 °C | 111.25 mm |
| November | 1.4 °C | 12.4 °C | 82.8 mm |
| December | -2.5 °C | 6.7 °C | 110.74 mm |
| Annual | 6.3 °C | 17.4 °C | 1211.81 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |