Boyertown, 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 17.3 °C (high). Annual precipitation averages 1238.8 Millimeters. Boyertown 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 | -5.7 °C | 3.7 °C | 86.87 mm |
| February | -4.9 °C | 5.2 °C | 69.6 mm |
| March | -0.9 °C | 10 °C | 101.6 mm |
| April | 4.8 °C | 17 °C | 97.54 mm |
| May | 10.3 °C | 22.4 °C | 103.63 mm |
| June | 15.5 °C | 27.4 °C | 117.09 mm |
| July | 18.2 °C | 30 °C | 125.73 mm |
| August | 17.3 °C | 29 °C | 114.3 mm |
| September | 13.2 °C | 25.3 °C | 127.51 mm |
| October | 6.8 °C | 18.4 °C | 108.46 mm |
| November | 1.3 °C | 12.2 °C | 83.06 mm |
| December | -2.6 °C | 6.4 °C | 103.38 mm |
| Annual | 6.1 °C | 17.3 °C | 1238.77 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 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 |