Bessemer, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4 °C (low) to 15.6 °C (high). Annual precipitation averages 1051.6 Millimeters. Bessemer 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 | -7.8 °C | 1.4 °C | 76.71 mm |
| February | -7.3 °C | 3.2 °C | 59.69 mm |
| March | -2.9 °C | 8.3 °C | 77.98 mm |
| April | 2.9 °C | 15.7 °C | 95.25 mm |
| May | 8.4 °C | 21.4 °C | 98.3 mm |
| June | 13.4 °C | 26.1 °C | 111 mm |
| July | 15.6 °C | 28.2 °C | 113.28 mm |
| August | 14.7 °C | 27.6 °C | 91.44 mm |
| September | 10.8 °C | 23.9 °C | 96.27 mm |
| October | 4.8 °C | 17.1 °C | 80.52 mm |
| November | -0.1 °C | 10.1 °C | 73.66 mm |
| December | -4.3 °C | 4.2 °C | 77.47 mm |
| Annual | 4 °C | 15.6 °C | 1051.57 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 |