Ellwood City, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.8 °C (low) to 16.2 °C (high). Annual precipitation averages 1036.6 Millimeters. Ellwood City is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -6.7 °C | 2.2 °C | 78.23 mm |
| February | -6.2 °C | 3.8 °C | 59.69 mm |
| March | -2.1 °C | 9.1 °C | 78.49 mm |
| April | 3.3 °C | 16.5 °C | 94.49 mm |
| May | 9.1 °C | 22.1 °C | 96.52 mm |
| June | 14 °C | 26.5 °C | 109.22 mm |
| July | 16.2 °C | 28.7 °C | 104.9 mm |
| August | 15.5 °C | 28.1 °C | 89.92 mm |
| September | 11.7 °C | 24.5 °C | 91.95 mm |
| October | 5.8 °C | 17.7 °C | 79.25 mm |
| November | 0.6 °C | 10.7 °C | 75.44 mm |
| December | -3.6 °C | 4.7 °C | 78.49 mm |
| Annual | 4.8 °C | 16.2 °C | 1036.59 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 11 - May 20 |
| 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 | Dfa - Humid Continental Hot Summers With Year Around Precipitation |