Kennett Square, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6.4 °C (low) to 17.3 °C (high). Annual precipitation averages 1240.5 Millimeters. Kennett Square 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 Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -5.2 °C | 4.4 °C | 89.41 mm |
| February | -4.8 °C | 5.5 °C | 74.42 mm |
| March | -0.8 °C | 10.3 °C | 110.24 mm |
| April | 5.1 °C | 17 °C | 96.52 mm |
| May | 10.6 °C | 22.3 °C | 98.81 mm |
| June | 15.6 °C | 27.2 °C | 115.06 mm |
| July | 18.6 °C | 29.7 °C | 122.17 mm |
| August | 17.7 °C | 28.8 °C | 109.98 mm |
| September | 13.6 °C | 25.2 °C | 122.68 mm |
| October | 6.8 °C | 18.7 °C | 112.52 mm |
| November | 1.4 °C | 12.2 °C | 83.57 mm |
| December | -2.4 °C | 6.7 °C | 105.16 mm |
| Annual | 6.4 °C | 17.3 °C | 1240.54 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 75-100 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 | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |