Heidlersburg, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6.1 °C (low) to 17.2 °C (high). Annual precipitation averages 1167.1 Millimeters. Heidlersburg 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 | -5.6 °C | 3.7 °C | 85.6 mm |
| February | -4.8 °C | 5.3 °C | 70.61 mm |
| March | -0.8 °C | 10.2 °C | 102.11 mm |
| April | 4.9 °C | 17.1 °C | 96.01 mm |
| May | 10.4 °C | 22.3 °C | 107.19 mm |
| June | 15.6 °C | 27.2 °C | 103.63 mm |
| July | 17.9 °C | 29.9 °C | 101.09 mm |
| August | 17 °C | 28.8 °C | 97.79 mm |
| September | 13 °C | 24.9 °C | 126.24 mm |
| October | 6.7 °C | 18.4 °C | 101.85 mm |
| November | 1.2 °C | 12.1 °C | 84.07 mm |
| December | -2.9 °C | 6 °C | 90.93 mm |
| Annual | 6.1 °C | 17.2 °C | 1167.12 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 | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |