Chalkhill, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 3.9 °C (low) to 14.9 °C (high). Annual precipitation averages 1388.1 Millimeters. Chalkhill is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -7.3 °C | 1.6 °C | 115.82 mm |
| February | -6.6 °C | 3.4 °C | 93.47 mm |
| March | -2.6 °C | 8.3 °C | 118.36 mm |
| April | 2.9 °C | 15.8 °C | 118.11 mm |
| May | 8.3 °C | 20.8 °C | 128.27 mm |
| June | 12.9 °C | 24.6 °C | 140.97 mm |
| July | 15.2 °C | 26.4 °C | 132.84 mm |
| August | 14.3 °C | 25.8 °C | 114.81 mm |
| September | 10.4 °C | 22.5 °C | 112.01 mm |
| October | 4.8 °C | 16.3 °C | 99.57 mm |
| November | -0.6 °C | 9.6 °C | 103.89 mm |
| December | -4.8 °C | 3.8 °C | 109.98 mm |
| Annual | 3.9 °C | 14.9 °C | 1388.1 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |