Chesterbrook, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6.6 °C (low) to 17.8 °C (high). Annual precipitation averages 1203.5 Millimeters. Chesterbrook 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. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -5.1 °C | 4.4 °C | 86.36 mm |
| February | -4.4 °C | 5.9 °C | 73.91 mm |
| March | -0.6 °C | 10.7 °C | 102.36 mm |
| April | 5.2 °C | 17.6 °C | 94.49 mm |
| May | 10.7 °C | 22.9 °C | 97.28 mm |
| June | 16 °C | 27.9 °C | 112.52 mm |
| July | 18.9 °C | 30.3 °C | 118.11 mm |
| August | 17.9 °C | 29.5 °C | 109.47 mm |
| September | 13.8 °C | 25.9 °C | 118.11 mm |
| October | 7.1 °C | 19.1 °C | 102.11 mm |
| November | 1.7 °C | 12.8 °C | 81.03 mm |
| December | -2.2 °C | 7.1 °C | 107.7 mm |
| Annual | 6.6 °C | 17.8 °C | 1203.45 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| 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 7a : -17.8°C to -15°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |