Bellwood, Pennsylvania has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 4.5 °C (low) to 15.9 °C (high). Annual precipitation averages 1064.3 Millimeters. Bellwood is located in USDA Plant Hardiness Zone 6b. 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 | -6.9 °C | 2.1 °C | 72.9 mm |
| February | -6.4 °C | 3.8 °C | 62.48 mm |
| March | -2.6 °C | 8.6 °C | 85.09 mm |
| April | 3.2 °C | 16.2 °C | 90.42 mm |
| May | 8.8 °C | 21.8 °C | 104.14 mm |
| June | 13.9 °C | 26.1 °C | 101.6 mm |
| July | 16.3 °C | 28.6 °C | 95.5 mm |
| August | 15.3 °C | 27.8 °C | 97.28 mm |
| September | 11.4 °C | 23.9 °C | 106.17 mm |
| October | 5.2 °C | 17.2 °C | 89.15 mm |
| November | 0.1 °C | 10.5 °C | 77.22 mm |
| December | -3.9 °C | 4.4 °C | 82.3 mm |
| Annual | 4.5 °C | 15.9 °C | 1064.25 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |