Coatesville, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.7 °C (low) to 17.4 °C (high). Annual precipitation averages 1295.4 Millimeters. Coatesville 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 | -5.8 °C | 4.3 °C | 95.25 mm |
| February | -5.5 °C | 5.4 °C | 76.96 mm |
| March | -1.3 °C | 10.2 °C | 110.74 mm |
| April | 4.4 °C | 17.2 °C | 100.08 mm |
| May | 9.9 °C | 22.5 °C | 102.36 mm |
| June | 14.9 °C | 27.2 °C | 122.43 mm |
| July | 17.9 °C | 29.7 °C | 124.71 mm |
| August | 17 °C | 29 °C | 114.81 mm |
| September | 12.7 °C | 25.4 °C | 128.52 mm |
| October | 6.1 °C | 18.8 °C | 119.63 mm |
| November | 0.7 °C | 12.3 °C | 88.9 mm |
| December | -3.1 °C | 6.6 °C | 111 mm |
| Annual | 5.7 °C | 17.4 °C | 1295.39 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| 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 | Severe Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |