Pottstown, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6.6 °C (low) to 17.8 °C (high). Annual precipitation averages 1228.1 Millimeters. Pottstown 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 | -5.2 °C | 4.4 °C | 86.36 mm |
| February | -4.4 °C | 5.8 °C | 71.63 mm |
| March | -0.5 °C | 10.6 °C | 101.6 mm |
| April | 5.2 °C | 17.6 °C | 95.5 mm |
| May | 10.7 °C | 22.9 °C | 99.82 mm |
| June | 16.2 °C | 27.8 °C | 111 mm |
| July | 19 °C | 30.3 °C | 119.63 mm |
| August | 18.1 °C | 29.4 °C | 112.01 mm |
| September | 13.8 °C | 25.8 °C | 134.11 mm |
| October | 7.2 °C | 19 °C | 109.73 mm |
| November | 1.6 °C | 12.8 °C | 81.79 mm |
| December | -2.3 °C | 7.1 °C | 104.9 mm |
| Annual | 6.6 °C | 17.8 °C | 1228.08 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 7a : -17.8°C to -15°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |