Broomall, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 8.2 °C (low) to 17.8 °C (high). Annual precipitation averages 1208.5 Millimeters. Broomall 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 | -3.4 °C | 4.5 °C | 89.41 mm |
| February | -2.7 °C | 5.9 °C | 72.9 mm |
| March | 0.9 °C | 10.9 °C | 109.47 mm |
| April | 6.6 °C | 17.7 °C | 93.22 mm |
| May | 11.9 °C | 22.9 °C | 99.31 mm |
| June | 17.2 °C | 28 °C | 111.25 mm |
| July | 20.4 °C | 30.4 °C | 115.06 mm |
| August | 19.6 °C | 29.4 °C | 118.62 mm |
| September | 15.8 °C | 26.1 °C | 112.27 mm |
| October | 9.2 °C | 18.6 °C | 99.57 mm |
| November | 3.6 °C | 12.6 °C | 79.5 mm |
| December | -0.6 °C | 7.1 °C | 107.95 mm |
| Annual | 8.2 °C | 17.8 °C | 1208.53 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 | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |