West Chester, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6.2 °C (low) to 17.2 °C (high). Annual precipitation averages 1245.1 Millimeters. West Chester 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 Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -5.4 °C | 4.1 °C | 90.93 mm |
| February | -5 °C | 5.3 °C | 74.42 mm |
| March | -0.9 °C | 10.1 °C | 110.74 mm |
| April | 4.9 °C | 16.9 °C | 96.27 mm |
| May | 10.4 °C | 22.2 °C | 99.31 mm |
| June | 15.4 °C | 27.1 °C | 113.28 mm |
| July | 18.3 °C | 29.4 °C | 113.54 mm |
| August | 17.4 °C | 28.8 °C | 111.51 mm |
| September | 13.3 °C | 25.2 °C | 128.02 mm |
| October | 6.8 °C | 18.6 °C | 113.03 mm |
| November | 1.6 °C | 12.1 °C | 84.33 mm |
| December | -2.4 °C | 6.5 °C | 109.73 mm |
| Annual | 6.2 °C | 17.2 °C | 1245.11 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 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |