Chester Hill, Pennsylvania has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 3 °C (low) to 14.7 °C (high). Annual precipitation averages 1074.2 Millimeters. Chester Hill is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -8.5 °C | 0.8 °C | 76.2 mm |
| February | -8 °C | 2.5 °C | 64.26 mm |
| March | -4.1 °C | 7.4 °C | 87.12 mm |
| April | 1.8 °C | 15.1 °C | 96.27 mm |
| May | 7.4 °C | 20.9 °C | 97.79 mm |
| June | 12.3 °C | 25.1 °C | 110.74 mm |
| July | 14.7 °C | 27.3 °C | 99.82 mm |
| August | 13.8 °C | 26.4 °C | 93.73 mm |
| September | 9.8 °C | 22.7 °C | 100.33 mm |
| October | 3.7 °C | 16 °C | 93.47 mm |
| November | -1.3 °C | 9.3 °C | 72.14 mm |
| December | -5.2 °C | 3.3 °C | 82.3 mm |
| Annual | 3 °C | 14.7 °C | 1074.17 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |