Bowmanstown, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.4 °C (low) to 16.1 °C (high). Annual precipitation averages 1277.9 Millimeters. Bowmanstown is located in USDA Plant Hardiness Zone 6b. 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 | -7.2 °C | 2.4 °C | 89.66 mm |
| February | -6.6 °C | 4.1 °C | 68.33 mm |
| March | -2.5 °C | 8.7 °C | 90.68 mm |
| April | 3.2 °C | 16.1 °C | 101.6 mm |
| May | 8.8 °C | 21.9 °C | 104.14 mm |
| June | 13.8 °C | 26.3 °C | 128.78 mm |
| July | 16.5 °C | 28.8 °C | 125.73 mm |
| August | 15.5 °C | 27.8 °C | 120.9 mm |
| September | 11.3 °C | 24.1 °C | 135.89 mm |
| October | 4.8 °C | 17.4 °C | 119.38 mm |
| November | -0.3 °C | 10.9 °C | 88.39 mm |
| December | -4.3 °C | 4.9 °C | 104.39 mm |
| Annual | 4.4 °C | 16.1 °C | 1277.87 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |